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Xeon Phi
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<h2 id="history">History</h2> <table><tbody><tr><th>Code name</th><th>Process</th><th>Comments</th></tr><tr><td>Knights Ferry</td><td>45 nm</td><td>offered as PCI Express card; derived from Larrabee project</td></tr><tr><td>Knights Corner</td><td>22 nm</td><td>derived from P54C; vector processing unit; first device to be announced as <i>Xeon Phi</i>; AVX-512-like encoding</td></tr><tr><td>Knights Landing</td><td>14 nm</td><td>derived from Silvermont/Airmont (Intel Atom);<a class="footnote-ref" id="fnref:11" href="#fn:11"><sup>11</sup></a> AVX-512</td></tr><tr><td>Knights Mill</td><td>14 nm</td><td>nearly identical to Knights Landing but optimized for deep learning</td></tr><tr><td>Knights Hill</td><td>10 nm</td><td>cancelled</td></tr></tbody></table> <h3>Background</h3> <p>The <a href="/facts/Larrabee_(microarchitecture)/SqD9e2Kj">Larrabee microarchitecture</a> (in development since 2006<a class="footnote-ref" id="fnref:12" href="#fn:12"><sup>12</sup></a>) introduced very wide (512-bit) <a href="/facts/SIMD/gQHWQSpo">SIMD</a> units to an <a href="/facts/X86/Kypq5fgu">x86</a> architecture based processor design, extended to a <a href="/facts/Cache_coherence/MhUD576q">cache-coherent</a> multiprocessor system connected via a ring bus to memory; each core was capable of four-way multithreading. Due to the design being intended for GPU as well as general purpose computing, the Larrabee chips also included specialised hardware for texture sampling.<a class="footnote-ref" id="fnref:13" href="#fn:13"><sup>13</sup></a><a class="footnote-ref" id="fnref:14" href="#fn:14"><sup>14</sup></a> The project to produce a retail GPU product directly from the Larrabee research project was terminated in May 2010.<a class="footnote-ref" id="fnref:15" href="#fn:15"><sup>15</sup></a> </p><p>Another contemporary Intel research project implementing x86 architecture on a many-multicore processor was the '<a href="/facts/Single-chip_Cloud_Computer/D1gCDhG3">Single-chip Cloud Computer</a>' (prototype introduced 2009<a class="footnote-ref" id="fnref:16" href="#fn:16"><sup>16</sup></a>), a design mimicking a <a href="/facts/Cloud_computing/guhg0FGV">cloud computing</a> computer datacentre on a single chip with multiple independent cores: the prototype design included 48 cores per chip with hardware support for selective frequency and voltage control of cores to maximize energy efficiency, and incorporated a <a href="/facts/Mesh_networking/XnVSy5rK">mesh network</a> for inter-chip messaging. The design lacked cache-coherent cores and focused on principles that would allow the design to scale to many more cores.<a class="footnote-ref" id="fnref:17" href="#fn:17"><sup>17</sup></a> </p><p>The <a href="/facts/Teraflops_Research_Chip/fp2yVaKM">Teraflops Research Chip</a> (prototype unveiled 2007<a class="footnote-ref" id="fnref:18" href="#fn:18"><sup>18</sup></a>) is an experimental 80-core chip with two <a href="/facts/Floating-point/eIckahxe">floating-point</a> units per core, implementing a 96-bit <a href="/facts/Very_long_instruction_word/WJuzewyR">VLIW</a> architecture instead of the x86 architecture.<a class="footnote-ref" id="fnref:19" href="#fn:19"><sup>19</sup></a> The project investigated intercore communication methods, per-chip power management, and achieved 1.01 <a href="/facts/TFLOPS/6zYlH68F">TFLOPS</a> at 3.16 GHz consuming 62 W of power.<a class="footnote-ref" id="fnref:20" href="#fn:20"><sup>20</sup></a><a class="footnote-ref" id="fnref:21" href="#fn:21"><sup>21</sup></a> </p> <h3>Knights Ferry</h3> <p>Intel's Many Integrated Core (MIC) prototype board, named <i>Knights Ferry</i>, incorporating a processor codenamed <i>Aubrey Isle</i> was announced 31 May 2010. The product was stated to be a derivative of the <i>Larrabee</i> project and other Intel research including the <i>Single-chip Cloud Computer</i>.<a class="footnote-ref" id="fnref:22" href="#fn:22"><sup>22</sup></a><a class="footnote-ref" id="fnref:23" href="#fn:23"><sup>23</sup></a> </p><p>The development product was offered as a PCIe card with 32 in-order cores at up to 1.2 GHz with four threads per core, 2 GB GDDR5 memory,<a class="footnote-ref" id="fnref:24" href="#fn:24"><sup>24</sup></a> and 8 MB coherent L2 cache (256 KB per core with 32 KB L1 cache), and a power requirement of ≈300 W,<a class="footnote-ref" id="fnref:25" href="#fn:25"><sup>25</sup></a> built at a 45 nm process.<a class="footnote-ref" id="fnref:26" href="#fn:26"><sup>26</sup></a> In the <i>Aubrey Isle</i> core a 1,024-bit ring bus (512-bit bi-directional) connects processors to main memory.<a class="footnote-ref" id="fnref:27" href="#fn:27"><sup>27</sup></a> Single-board performance has exceeded 750 GFLOPS.<a class="footnote-ref" id="fnref:28" href="#fn:28"><sup>28</sup></a> The prototype boards only support <a href="/facts/Single-precision/e6Fez7BM">single-precision</a> floating-point instructions.<a class="footnote-ref" id="fnref:29" href="#fn:29"><sup>29</sup></a> </p><p>Initial developers included <a href="/facts/CERN/y1gwRchm">CERN</a>, <a href="/facts/Korea_Institute_of_Science_and_Technology_Information/UbcQNIns">Korea Institute of Science and Technology Information</a> (KISTI) and <a href="/facts/Leibniz_Supercomputing_Centre/vQPKGtAr">Leibniz Supercomputing Centre</a>. Hardware vendors for prototype boards included IBM, SGI, HP, Dell and others.<a class="footnote-ref" id="fnref:30" href="#fn:30"><sup>30</sup></a> </p> <h3>Knights Corner</h3> <p>The <i>Knights Corner</i> product line is made at a 22 nm process size, using Intel's <a href="/facts/Trigate_Transistors/YTeIYBvc">Tri-gate</a> technology with more than 50 cores per chip, and is Intel's first many-cores commercial product.<a class="footnote-ref" id="fnref:31" href="#fn:31"><sup>31</sup></a><a class="footnote-ref" id="fnref:32" href="#fn:32"><sup>32</sup></a> </p><p>In June 2011, <a href="/facts/Silicon_Graphics_International/IfrJDnHP">SGI</a> announced a partnership with Intel to use the MIC architecture in its high-performance computing products.<a class="footnote-ref" id="fnref:33" href="#fn:33"><sup>33</sup></a> In September 2011, it was announced that the <a href="/facts/Texas_Advanced_Computing_Center/vm3Vj3Gt">Texas Advanced Computing Center</a> (TACC) will use Knights Corner cards in their 10-petaFLOPS "Stampede" supercomputer, providing 8 petaFLOPS of compute power.<a class="footnote-ref" id="fnref:34" href="#fn:34"><sup>34</sup></a> According to "Stampede: A Comprehensive Petascale Computing Environment" the "second-generation Intel (Knights Landing) MICs will be added when they become available, increasing Stampede's aggregate peak performance to at least 15 PetaFLOPS."<a class="footnote-ref" id="fnref:35" href="#fn:35"><sup>35</sup></a> </p><p>On 15 November 2011, Intel showed an early silicon version of a Knights Corner processor.<a class="footnote-ref" id="fnref:36" href="#fn:36"><sup>36</sup></a><a class="footnote-ref" id="fnref:37" href="#fn:37"><sup>37</sup></a> </p><p>On 5 June 2012, Intel released open source software and documentation regarding Knights Corner.<a class="footnote-ref" id="fnref:38" href="#fn:38"><sup>38</sup></a> </p><p>On 18 June 2012, Intel announced at the 2012 Hamburg <a href="/facts/International_Supercomputing_Conference/9VYpFtoV">International Supercomputing Conference</a> that <i>Xeon Phi</i> will be the <a href="/facts/Brand_name/hP6SnDWU">brand name</a> used for all products based on their Many Integrated Core architecture.<a class="footnote-ref" id="fnref:39" href="#fn:39"><sup>39</sup></a><a class="footnote-ref" id="fnref:40" href="#fn:40"><sup>40</sup></a><a class="footnote-ref" id="fnref:41" href="#fn:41"><sup>41</sup></a><a class="footnote-ref" id="fnref:42" href="#fn:42"><sup>42</sup></a><a class="footnote-ref" id="fnref:43" href="#fn:43"><sup>43</sup></a><a class="footnote-ref" id="fnref:44" href="#fn:44"><sup>44</sup></a><a class="footnote-ref" id="fnref:45" href="#fn:45"><sup>45</sup></a> In June 2012, <a href="/facts/Cray/coAlupuy">Cray</a> announced it would be offering 22 nm 'Knight's Corner' chips (branded as 'Xeon Phi') as a co-processor in its 'Cascade' systems.<a class="footnote-ref" id="fnref:46" href="#fn:46"><sup>46</sup></a><a class="footnote-ref" id="fnref:47" href="#fn:47"><sup>47</sup></a> </p><p>In June 2012, ScaleMP announced a virtualization update allowing Xeon Phi as a transparent processor extension, allowing legacy <a href="/facts/MMX_(instruction_set)/8o3JJhns">MMX</a>/<a href="/facts/Streaming_SIMD_Extensions/mMa6EFyB">SSE</a> code to run without code changes.<a class="footnote-ref" id="fnref:48" href="#fn:48"><sup>48</sup></a> An important component of the Intel Xeon Phi coprocessor's core is its vector processing unit (VPU).<a class="footnote-ref" id="fnref:49" href="#fn:49"><sup>49</sup></a> The VPU features a novel 512-bit SIMD instruction set, officially known as Intel Initial Many Core Instructions (Intel IMCI). Thus, the VPU can execute 16 <a href="/facts/Single-precision_floating-point_format/e6Fez7BM">single-precision</a> (SP) or 8 <a href="/facts/Double-precision_floating-point_format/JYyXXYFM">double-precision</a> (DP) operations per cycle. The VPU also supports Fused Multiply-Add (FMA) instructions and hence can execute 32 SP or 16 DP floating point operations per cycle. It also provides support for integers. The VPU also features an Extended Math Unit (EMU) that can execute operations such as reciprocal, square root, and logarithm, thereby allowing these operations to be executed in a vector fashion with high bandwidth. The EMU operates by calculating polynomial approximations of these functions. </p><p>On 12 November 2012, Intel announced two Xeon Phi coprocessor families using the 22 nm process size: the Xeon Phi 3100 and the Xeon Phi 5110P.<a class="footnote-ref" id="fnref:50" href="#fn:50"><sup>50</sup></a><a class="footnote-ref" id="fnref:51" href="#fn:51"><sup>51</sup></a><a class="footnote-ref" id="fnref:52" href="#fn:52"><sup>52</sup></a> The Xeon Phi 3100 will be capable of more than 1 teraFLOPS of <a href="/facts/Double-precision/JYyXXYFM">double-precision</a> floating-point instructions with 240 GB/s memory bandwidth at 300 W.<a class="footnote-ref" id="fnref:53" href="#fn:53"><sup>53</sup></a><a class="footnote-ref" id="fnref:54" href="#fn:54"><sup>54</sup></a><a class="footnote-ref" id="fnref:55" href="#fn:55"><sup>55</sup></a> The Xeon Phi 5110P will be capable of 1.01 teraFLOPS of double-precision floating-point instructions with 320 GB/s memory bandwidth at 225 W.<a class="footnote-ref" id="fnref:56" href="#fn:56"><sup>56</sup></a><a class="footnote-ref" id="fnref:57" href="#fn:57"><sup>57</sup></a><a class="footnote-ref" id="fnref:58" href="#fn:58"><sup>58</sup></a> The Xeon Phi 7120P will be capable of 1.2 teraFLOPS of double-precision floating-point instructions with 352 GB/s memory bandwidth at 300 W. </p><p>On 17 June 2013, the <a href="/facts/Tianhe-2/SwTCG6Hp">Tianhe-2</a> supercomputer was announced<a class="footnote-ref" id="fnref:59" href="#fn:59"><sup>59</sup></a> by <a href="/facts/TOP500/rz8zbyss">TOP500</a> as the world's fastest. Tianhe-2 used Intel Ivy Bridge Xeon and Xeon Phi processors to achieve 33.86 petaFLOPS. It was the fastest on the list for two and a half years, lastly in November 2015.<a class="footnote-ref" id="fnref:60" href="#fn:60"><sup>60</sup></a> </p> <h4>Design and programming</h4> <p>The cores of Knights Corner are based on a modified version of <a href="/facts/P5_(microarchitecture)/dqChAmxz">P54C</a> design, used in the original Pentium.<a class="footnote-ref" id="fnref:61" href="#fn:61"><sup>61</sup></a> The basis of the Intel MIC architecture is to leverage x86 legacy by creating an x86-compatible multiprocessor architecture that can use existing parallelization software tools.<a class="footnote-ref" id="fnref:62" href="#fn:62"><sup>62</sup></a> Programming tools include <a href="/facts/OpenMP/69IpI80o">OpenMP</a>,<a class="footnote-ref" id="fnref:63" href="#fn:63"><sup>63</sup></a> <a href="/facts/OpenCL/ns8y6np7">OpenCL</a>,<a class="footnote-ref" id="fnref:64" href="#fn:64"><sup>64</sup></a> <a href="/facts/Cilk/nIftzSWW">Cilk</a>/<a href="/facts/Cilk_Plus/nIftzSWW">Cilk Plus</a> and specialised versions of Intel's Fortran, C++<a class="footnote-ref" id="fnref:65" href="#fn:65"><sup>65</sup></a> and math libraries.<a class="footnote-ref" id="fnref:66" href="#fn:66"><sup>66</sup></a> </p><p>Design elements inherited from the Larrabee project include x86 ISA, 4-way <a href="/facts/Simultaneous_multithreading/bk8ec9yn">SMT</a> per core, 512-bit SIMD units, 32 KB L1 instruction cache, 32 KB L1 data cache, coherent L2 cache (512 KB per core<a class="footnote-ref" id="fnref:67" href="#fn:67"><sup>67</sup></a>), and ultra-wide ring bus connecting processors and memory. </p><p>The Knights Corner 512-bit SIMD instructions share many intrinsic functions with AVX-512 extension . The instruction set documentation is available from Intel under the extension name of KNC.<a class="footnote-ref" id="fnref:68" href="#fn:68"><sup>68</sup></a><a class="footnote-ref" id="fnref:69" href="#fn:69"><sup>69</sup></a><a class="footnote-ref" id="fnref:70" href="#fn:70"><sup>70</sup></a><a class="footnote-ref" id="fnref:71" href="#fn:71"><sup>71</sup></a> </p> Models of Xeon Phi X100 Series<table><tbody><tr><th rowspan="2">Name</th><th rowspan="2">Serial Code</th><th rowspan="2"><a href="/facts/Multi-core_processor/ABNb65hQ">Cores</a>(<a href="/facts/Multithreading_(computer_architecture)/ojEKsSNP">Threads</a> @ 4× core)</th><th colspan="2">Clock (MHz)</th><th rowspan="2">L2cache</th><th colspan="3">GDDR5 ECC memory</th><th rowspan="2">Peak DPcompute(GFLOPS)</th><th rowspan="2">TDP(W)</th><th rowspan="2">Coolingsystem</th><th rowspan="2">Form factor</th><th rowspan="2">Released</th></tr><tr><th>Base</th><th>Turbo</th><th>Quantity</th><th>Channels</th><th colspan="1">BWGB/s</th></tr><tr><td rowspan="2">Xeon Phi 3110X<a class="footnote-ref" id="fnref:72" href="#fn:72"><sup>72</sup></a></td><td rowspan="2">SE3110X</td><td rowspan="2">061 (244)</td><td rowspan="2">1053</td><td rowspan="2">–</td><td rowspan="2">30.5 MB</td><td>06 GB</td><td>12</td><td>240</td><td rowspan="2">1028</td><td rowspan="2">300</td><td rowspan="2">Bare board</td><td rowspan="6">PCIe 2.0 x16 card</td><td rowspan="2">November, 2012</td></tr><tr><td>08 GB</td><td>16</td><td>320</td></tr><tr><td>Xeon Phi 3120A<a class="footnote-ref" id="fnref:73" href="#fn:73"><sup>73</sup></a></td><td>SC3120A</td><td>057 (228)</td><td>1100</td><td>–</td><td>28.5 MB</td><td>06 GB</td><td>12</td><td>240</td><td>1003</td><td>300</td><td>Fan/<a href="/facts/Heatsink/ccIEdHnq">heatsink</a></td><td>17 June 2013</td></tr><tr><td>Xeon Phi 3120P <a class="footnote-ref" id="fnref:74" href="#fn:74"><sup>74</sup></a></td><td>SC3120P</td><td>057 (228)</td><td>1100</td><td>–</td><td>28.5 MB</td><td>06 GB</td><td>12</td><td>240</td><td>1003</td><td>300</td><td>Passive heatsink</td><td>17 June 2013</td></tr><tr><td>Xeon Phi 31S1P<a class="footnote-ref" id="fnref:75" href="#fn:75"><sup>75</sup></a></td><td>BC31S1P</td><td>057 (228)</td><td>1100</td><td>–</td><td>28.5 MB</td><td>08 GB</td><td>16</td><td>320</td><td>1003</td><td>270</td><td>Passive heatsink</td><td>17 June 2013</td></tr><tr><td>Xeon Phi 5110P<a class="footnote-ref" id="fnref:76" href="#fn:76"><sup>76</sup></a></td><td>SC5110P</td><td>060 (240)</td><td>1053</td><td>–</td><td>30.0 MB</td><td>08 GB</td><td>16</td><td>320</td><td>1011</td><td>225</td><td>Passive heatsink</td><td>12 Nov 2012</td></tr><tr><td rowspan="2">Xeon Phi 5120D<a class="footnote-ref" id="fnref:77" href="#fn:77"><sup>77</sup></a></td><td>SC5120D</td><td rowspan="2">060 (240)</td><td rowspan="2">1053</td><td rowspan="2">-</td><td rowspan="2">30.0 MB</td><td rowspan="2">08 GB</td><td rowspan="2">16</td><td rowspan="2">352</td><td rowspan="2">1011</td><td rowspan="2">245</td><td rowspan="2">Bare board</td><td rowspan="2">SFF 230-pin card</td><td rowspan="2">17 June 2013</td></tr><tr><td>BC5120D</td></tr><tr><td>Xeon Phi SE10P<a class="footnote-ref" id="fnref:78" href="#fn:78"><sup>78</sup></a></td><td>SE10P</td><td>061 (244)</td><td>1100</td><td>-</td><td>30.5 MB</td><td>08 GB</td><td>16</td><td>352</td><td>1074</td><td>300</td><td>Passive heatsink</td><td rowspan="5">PCIe 2.0 x16 card</td><td>12 Nov. 2012</td></tr><tr><td>Xeon Phi SE10X<a class="footnote-ref" id="fnref:79" href="#fn:79"><sup>79</sup></a></td><td>SE10X</td><td>061 (244)</td><td>1100</td><td>–</td><td>30.5 MB</td><td>08 GB</td><td>16</td><td>352</td><td>1074</td><td>300</td><td>Bare board</td><td>12 Nov. 2012</td></tr><tr><td>Xeon Phi 7110P<a class="footnote-ref" id="fnref:80" href="#fn:80"><sup>80</sup></a></td><td>SC7110P</td><td>061 (244)</td><td>1100</td><td>1250</td><td>30.5 MB</td><td>16 GB</td><td>16</td><td>352</td><td>1220</td><td>300</td><td>Passive heatsink</td><td>???</td></tr><tr><td>Xeon Phi 7110X<a class="footnote-ref" id="fnref:81" href="#fn:81"><sup>81</sup></a></td><td>SC7110X</td><td>061 (244)</td><td>1250</td><td>???</td><td>30.5 MB</td><td>16 GB</td><td>16</td><td>352</td><td>1220</td><td>300</td><td>Bare board</td><td>???</td></tr><tr><td>Xeon Phi 7120A<a class="footnote-ref" id="fnref:82" href="#fn:82"><sup>82</sup></a></td><td>SC7120A</td><td>061 (244)</td><td>1238</td><td>1333</td><td>30.5 MB</td><td>16 GB</td><td>16</td><td>352</td><td>1208</td><td>300</td><td>Fan/heatsink</td><td>6 April 2014</td></tr><tr><td>Xeon Phi 7120D<a class="footnote-ref" id="fnref:83" href="#fn:83"><sup>83</sup></a></td><td>SC7120D</td><td>061 (244)</td><td>1238</td><td>1333</td><td>30.5 MB</td><td>16 GB</td><td>16</td><td>352</td><td>1208</td><td>270</td><td>Bare board</td><td>SFF 230-pin card</td><td>March ??, 2014</td></tr><tr><td>Xeon Phi 7120P<a class="footnote-ref" id="fnref:84" href="#fn:84"><sup>84</sup></a></td><td>SC7120P</td><td>061 (244)</td><td>1238</td><td>1333</td><td>30.5 MB</td><td>16 GB</td><td>16</td><td>352</td><td>1208</td><td>300</td><td>Passive heatsink</td><td rowspan="2">PCIe 2.0 x16 card</td><td>17 June 2013</td></tr><tr><td>Xeon Phi 7120X<a class="footnote-ref" id="fnref:85" href="#fn:85"><sup>85</sup></a></td><td>SC7120X</td><td>061 (244)</td><td>1238</td><td>1333</td><td>30.5 MB</td><td>16 GB</td><td>16</td><td>352</td><td>1208</td><td>300</td><td>Bare board</td><td>17 June 2013</td></tr></tbody></table> <h3>Knights Landing</h3> <p>Code name for the second-generation MIC architecture product from Intel.<a class="footnote-ref" id="fnref:86" href="#fn:86"><sup>86</sup></a> Intel officially first revealed details of its second-generation Intel Xeon Phi products on 17 June 2013.<a class="footnote-ref" id="fnref:87" href="#fn:87"><sup>87</sup></a> Intel said that the next generation of Intel MIC Architecture-based products will be available in two forms, as a coprocessor or a host processor (CPU), and be manufactured using Intel's <a href="/facts/14_nanometer/lQYsD92n">14 nm</a> process technology. Knights Landing products will include integrated on-package memory for significantly higher memory bandwidth. </p><p>Knights Landing contains up to 72 <a href="/facts/Airmont_(microarchitecture)/Ffu5eJuS">Airmont</a> (Atom) cores with four threads per core,<a class="footnote-ref" id="fnref:88" href="#fn:88"><sup>88</sup></a><a class="footnote-ref" id="fnref:89" href="#fn:89"><sup>89</sup></a> using <a href="/facts/LGA_3647/wzexW0x5">LGA 3647</a> socket<a class="footnote-ref" id="fnref:90" href="#fn:90"><sup>90</sup></a> supporting up to 384 GB of "far" DDR4 2133 RAM and 8–16 GB of stacked "near" 3D <a href="/facts/MCDRAM/VaaAxUlv">MCDRAM</a>, a version of the <a href="/facts/Hybrid_Memory_Cube/0fTzfXkK">Hybrid Memory Cube</a>. Each core has two 512-bit vector units and supports <a href="/facts/AVX-512/2KpGqI8t">AVX-512</a> SIMD instructions, specifically the Intel AVX-512 Foundational Instructions (AVX-512F) with Intel AVX-512 Conflict Detection Instructions (AVX-512CD), Intel AVX-512 Exponential and Reciprocal Instructions (AVX-512ER), and Intel AVX-512 Prefetch Instructions (AVX-512PF). Support for IMCI has been removed in favor of AVX-512.<a class="footnote-ref" id="fnref:91" href="#fn:91"><sup>91</sup></a> </p><p>The <a href="/facts/National_Energy_Research_Scientific_Computing_Center/PQM6U4xU">National Energy Research Scientific Computing Center</a> announced that Phase 2 of its newest supercomputing system "Cori" would use Knights Landing Xeon Phi coprocessors.<a class="footnote-ref" id="fnref:92" href="#fn:92"><sup>92</sup></a> </p><p>On 20 June 2016, Intel launched the Intel Xeon Phi product family x200 based on the Knights Landing architecture, stressing its applicability to not just traditional simulation workloads, but also to <a href="/facts/Machine_learning/e0w0XJTu">machine learning</a>.<a class="footnote-ref" id="fnref:93" href="#fn:93"><sup>93</sup></a><a class="footnote-ref" id="fnref:94" href="#fn:94"><sup>94</sup></a> The model lineup announced at launch included only Xeon Phi of bootable form-factor, but two versions of it: standard processors and processors with integrated Intel <a href="/facts/Omni-Path/uqL5Ct3r">Omni-Path</a> architecture fabric.<a class="footnote-ref" id="fnref:95" href="#fn:95"><sup>95</sup></a> The latter is denoted by the suffix F in the model number. Integrated fabric is expected to provide better latency at a lower cost than discrete high-performance network cards.<a class="footnote-ref" id="fnref:96" href="#fn:96"><sup>96</sup></a> </p><p>On 14 November 2016, the 48th list of <a href="/facts/TOP500/rz8zbyss">TOP500</a> contained two systems using Knights Landing in the Top 10.<a class="footnote-ref" id="fnref:97" href="#fn:97"><sup>97</sup></a> </p><p>The <a href="/facts/PCIe/ADhsLCUK">PCIe</a> based co-processor variant of Knight's Landing was never offered to the general market and was discontinued by August 2017.<a class="footnote-ref" id="fnref:98" href="#fn:98"><sup>98</sup></a> This included the 7220A, 7240P and 7220P coprocessor cards. </p><p>Intel announced they were discontinuing Knights Landing in summer 2018.<a class="footnote-ref" id="fnref:99" href="#fn:99"><sup>99</sup></a> </p> <h4>Models</h4> <p>All models can boost to their peak speeds, adding 200 MHz to their base frequency when running just one or two cores. When running from three to the maximum number of cores, the chips can only boost 100 MHz above the base frequency. All chips run high-AVX code at a frequency reduced by 200 MHz.<a class="footnote-ref" id="fnref:100" href="#fn:100"><sup>100</sup></a> </p> Models of Xeon Phi X200 Coprocessor Series<table><tbody><tr><th rowspan="2">Name</th><th rowspan="2">Serial Code</th><th rowspan="2">Cores(Threads @ 4× core)</th><th colspan="2">Clock (MHz)</th><th rowspan="2">L2cache</th><th colspan="2">MCDRAM memory</th><th colspan="2">DDR4 memory</th><th rowspan="2">TDP(W)</th><th rowspan="2">Coolingsystem</th><th rowspan="2">Form factor</th><th rowspan="2">Released</th></tr><tr><th>Base</th><th>Turbo</th><th>Quantity</th><th>BW</th><th colspan="1">Capacity</th><th>BW</th></tr><tr><td>Xeon Phi 7220A<a class="footnote-ref" id="fnref:101" href="#fn:101"><sup>101</sup></a></td><td>SC7220A</td><td rowspan="3">68 (272)</td><td rowspan="2">1200</td><td rowspan="2">1400</td><td rowspan="3">34 MB</td><td rowspan="3">16 GB</td><td rowspan="3">400+ GB/s</td><td rowspan="3">384 GB</td><td rowspan="3">102.4 GB/s</td><td rowspan="3">275</td><td>Active heatsink</td><td rowspan="3">PCIe 3.0 x16 card</td><td rowspan="3">???</td></tr><tr><td>Xeon Phi 7220P<a class="footnote-ref" id="fnref:102" href="#fn:102"><sup>102</sup></a></td><td>SC7220P</td><td rowspan="2">Passive heatsink</td></tr><tr><td>Xeon Phi 7240P<a class="footnote-ref" id="fnref:103" href="#fn:103"><sup>103</sup></a></td><td>SC7240P</td><td>1300</td><td>1500</td></tr></tbody></table> Models of Xeon Phi X200 CPU Series<table><tbody><tr><th rowspan="2">Xeon Phi7200 Series</th><th rowspan="2">sSpecnumber</th><th rowspan="2">Cores(Threads)</th><th colspan="2">Clock (MHz)</th><th rowspan="2">L2cache</th><th colspan="2">MCDRAM memory</th><th colspan="2">DDR4 memory</th><th rowspan="2">Peak DPcompute</th><th rowspan="2"><a href="/facts/Thermal_Design_Power/Idcy26tM">TDP</a>(W)</th><th rowspan="2">Socket</th><th rowspan="2">Release date</th><th rowspan="2">Part number</th></tr><tr><th>Base</th><th>Turbo</th><th>Quantity</th><th>BW</th><th>Capacity</th><th>BW</th></tr><tr><td rowspan="2">Xeon Phi 7210<a class="footnote-ref" id="fnref:104" href="#fn:104"><sup>104</sup></a></td><td>SR2ME (B0)</td><td rowspan="6">64 (256)</td><td rowspan="6">1300</td><td rowspan="6">1500</td><td rowspan="6">32 MB</td><td rowspan="11">16 GB</td><td rowspan="11">400+ GB/s</td><td rowspan="11">384 GB</td><td rowspan="11">102.4 GB/s</td><td rowspan="6">2662GFLOPS</td><td rowspan="2">215</td><td rowspan="11">SVLCLGA3647</td><td rowspan="11">20 June 2016</td><td rowspan="2">HJ8066702859300</td></tr><tr><td>SR2X4 (B0)</td></tr><tr><td>Xeon Phi 7210F<a class="footnote-ref" id="fnref:105" href="#fn:105"><sup>105</sup></a></td><td>SR2X5 (B0)</td><td>230</td><td>HJ8066702975000</td></tr><tr><td rowspan="2">Xeon Phi 7230<a class="footnote-ref" id="fnref:106" href="#fn:106"><sup>106</sup></a></td><td>SR2MF (B0)</td><td rowspan="2">215</td><td rowspan="2">HJ8066702859400</td></tr><tr><td>SR2X3 (B0)</td></tr><tr><td>Xeon Phi 7230F<a class="footnote-ref" id="fnref:107" href="#fn:107"><sup>107</sup></a></td><td>SR2X2 (B0)</td><td>230</td><td>HJ8066702269002</td></tr><tr><td rowspan="2">Xeon Phi 7250<a class="footnote-ref" id="fnref:108" href="#fn:108"><sup>108</sup></a></td><td>SR2MD (B0)</td><td rowspan="3">68 (272)</td><td rowspan="3">1400</td><td rowspan="3">1600</td><td rowspan="3">34 MB</td><td rowspan="3">3046GFLOPS<a class="footnote-ref" id="fnref:109" href="#fn:109"><sup>109</sup></a></td><td rowspan="2">215</td><td rowspan="2">HJ8066702859200</td></tr><tr><td>SR2X1 (B0)</td></tr><tr><td>Xeon Phi 7250F<a class="footnote-ref" id="fnref:110" href="#fn:110"><sup>110</sup></a></td><td>SR2X0 (B0)</td><td>230</td><td>HJ8066702268900</td></tr><tr><td>Xeon Phi 7290<a class="footnote-ref" id="fnref:111" href="#fn:111"><sup>111</sup></a></td><td>SR2WY (B0)</td><td rowspan="2">72 (288)</td><td rowspan="2">1500</td><td rowspan="2">1700</td><td rowspan="2">36 MB</td><td rowspan="2">3456GFLOPS</td><td>245</td><td>HJ8066702974700</td></tr><tr><td>Xeon Phi 7290F<a class="footnote-ref" id="fnref:112" href="#fn:112"><sup>112</sup></a></td><td>SR2WZ (B0)</td><td>260</td><td>HJ8066702975200</td></tr></tbody></table> <h3>Knights Mill</h3> <p>Knights Mill is Intel's codename for a Xeon Phi product specialized in <a href="/facts/Deep_learning/JLuwD3ea">deep learning</a>,<a class="footnote-ref" id="fnref:113" href="#fn:113"><sup>113</sup></a> initially released in December 2017.<a class="footnote-ref" id="fnref:114" href="#fn:114"><sup>114</sup></a> Nearly identical in specifications to Knights Landing, Knights Mill includes optimizations for better utilization of AVX-512 instructions. Single-precision and variable-precision floating-point performance increased, at the expense of double-precision floating-point performance. </p><p>Models </p> Models of Xeon Phi X205 CPU Series<table><tbody><tr><th rowspan="2">Xeon Phi72x5 Series</th><th rowspan="2">sSpecnumber</th><th rowspan="2">Cores(Threads)</th><th colspan="2">Clock (MHz)</th><th rowspan="2">L2cache</th><th colspan="2">MCDRAM memory</th><th colspan="2">DDR4 memory</th><th rowspan="2">Peak DPcompute</th><th rowspan="2"><a href="/facts/Thermal_Design_Power/Idcy26tM">TDP</a>(W)</th><th rowspan="2">Socket</th><th rowspan="2">Release date</th><th rowspan="2">Part number</th></tr><tr><th>Base</th><th>Turbo</th><th>Quantity</th><th>BW</th><th>Capacity</th><th>BW</th></tr><tr><td>Xeon Phi 7235</td><td>SR3VF (A0)</td><td>64 (256)</td><td>1300</td><td>1400</td><td>32 MB</td><td rowspan="4">16 GB</td><td rowspan="4">400+ GB/s</td><td rowspan="4">384 GB</td><td>102.4 GB/s</td><td>TBA</td><td>250</td><td rowspan="4">SVLCLGA3647</td><td rowspan="4">Q4 2017</td><td>HJ8068303823900</td></tr><tr><td>Xeon Phi 7255</td><td>SR3VG (A0)</td><td>68 (272)</td><td>1100</td><td>1200</td><td>34 MB</td><td>115.2 GB/s</td><td>TBA</td><td>215</td><td>HJ8068303826300</td></tr><tr><td>Xeon Phi 7285</td><td>SR3VE (A0)</td><td>68 (272)</td><td>1300</td><td>1400</td><td>34 MB</td><td>115.2 GB/s</td><td>TBA</td><td>250</td><td>HJ8068303823800</td></tr><tr><td>Xeon Phi 7295</td><td>SR3VD (A0)</td><td>72 (288)</td><td>1500</td><td>1600</td><td>36 MB</td><td>115.2 GB/s</td><td>TBA</td><td>320</td><td>HJ8068303823700</td></tr></tbody></table> <h3>Knights Hill</h3> <p>Knights Hill was the codename for the third-generation MIC architecture, for which Intel announced the first details at SC14.<a class="footnote-ref" id="fnref:115" href="#fn:115"><sup>115</sup></a> It was to be manufactured in a 10 nm process.<a class="footnote-ref" id="fnref:116" href="#fn:116"><sup>116</sup></a> </p><p>Knights Hill was expected to be used in the <a href="/facts/United_States_Department_of_Energy/PRp6Cz8g">United States Department of Energy</a> <a href="/facts/Aurora_(supercomputer)/yuGqSbxJ">Aurora supercomputer</a>, to be deployed at <a href="/facts/Argonne_National_Laboratory/EAoR1Rnm">Argonne National Laboratory</a>.<a class="footnote-ref" id="fnref:117" href="#fn:117"><sup>117</sup></a><a class="footnote-ref" id="fnref:118" href="#fn:118"><sup>118</sup></a> However, Aurora was delayed in favor of using an "advanced architecture" with a focus on machine learning.<a class="footnote-ref" id="fnref:119" href="#fn:119"><sup>119</sup></a><a class="footnote-ref" id="fnref:120" href="#fn:120"><sup>120</sup></a> </p><p>In 2017, Intel announced that Knights Hill had been canceled in favor of another architecture built from the ground up to enable <a href="/facts/Exascale_computing/HEb6YV2v">Exascale computing</a> in the future. This new architecture was expected for 2020–2021,<a class="footnote-ref" id="fnref:121" href="#fn:121"><sup>121</sup></a><a class="footnote-ref" id="fnref:122" href="#fn:122"><sup>122</sup></a> however this was also cancelled due to the discontinuation of the Xeon Phi. </p> <h2 id="programming">Programming</h2> <p>One performance and programmability study reported that achieving high performance with Xeon Phi still needs help from programmers and that merely relying on compilers with traditional programming models is insufficient.<a class="footnote-ref" id="fnref:123" href="#fn:123"><sup>123</sup></a> Other studies in various domains, such as life sciences<a class="footnote-ref" id="fnref:124" href="#fn:124"><sup>124</sup></a> and deep learning,<a class="footnote-ref" id="fnref:125" href="#fn:125"><sup>125</sup></a> have shown that exploiting the thread- and SIMD-parallelism of Xeon Phi achieves significant speed-ups. </p> <h2 id="competitors">Competitors</h2> <ul><li><a href="/facts/Nvidia_Tesla/SsHo1w98">Nvidia Tesla</a>, a direct competitor in the <a href="/facts/High-performance_computing/HT9NwGAN">HPC</a> market<a class="footnote-ref" id="fnref:126" href="#fn:126"><sup>126</sup></a></li> <li><a href="/facts/AMD_Radeon_Pro/HovUeehy">AMD Radeon Pro</a> and <a href="/facts/Radeon_Instinct/awBes71U">AMD Radeon Instinct</a> direct competitors in the HPC market</li></ul> <h2 id="see-also">See also</h2> <ul><li><a href="/facts/Texas_Advanced_Computing_Center/vm3Vj3Gt">Texas Advanced Computing Center</a> – "Stampede" supercomputer incorporates Xeon Phi chips.<a class="footnote-ref" id="fnref:127" href="#fn:127"><sup>127</sup></a> Stampede is capable of 10 petaFLOPS.<a class="footnote-ref" id="fnref:128" href="#fn:128"><sup>128</sup></a></li> <li><a href="/facts/AVX-512/2KpGqI8t">AVX-512</a></li> <li><a href="/facts/Cell_(microprocessor)/p2MIQjMc">Cell (microprocessor)</a></li> <li><a href="/facts/Intel_Tera-Scale/QQpr1wcf">Intel Tera-Scale</a></li> <li><a href="/facts/Massively_parallel/dX7W2Nxs">Massively parallel</a></li> <li><a href="/facts/Xeon/j1M8Hp6D">Xeon</a></li></ul> <h2 id="external-links">External links</h2> Wikimedia Commons has media related to Xeon Phi. <ul><li>Intel pages: <a href="https://www.intel.com/content/www/us/en/products/processors/xeon-phi/xeon-phi-processors.html">Intel Xeon Phi Processors</a></li> <li>Chips and Cheese, December 8, 2022, <a href="https://chipsandcheese.com/2022/12/08/knights-landing-atom-with-avx-512/">Knight's Landing: Atom with AVX-512</a></li> <li></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Radek (18 June 2012). 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