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AMD
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an American multinational [https://en.wikipedia.org/wiki/Semiconductor_industry semiconductor] company based in [https://en.wikipedia.org/wiki/Sunnyvale,_California Sunnyvale, California], and behind [[Intel]] the second-largest global supplier of microprocessors based on the [[x86]] architecture and also one of the largest suppliers of [https://en.wikipedia.org/wiki/Graphics_processing_unit graphics processing] units <ref>[https://en.wikipedia.org/wiki/Advanced_Micro_Devices Advanced Micro Devices from Wikipedia]</ref> .
In 2003, AMD launched the [https://en.wikipedia.org/wiki/Athlon_64 Athlon 64] (Hammer, AMD64, K8) and pioneered the [[x86-64]] instruction set. Until Intel introduced the [https://en.wikipedia.org/wiki/Intel_Core_2 Core 2] [https://en.wikipedia.org/wiki/Microarchitecture microarchitecture] in 2006, AMD64 was the dominating architecture for computer chess in the 2000s. With the [https://en.wikipedia.org/wiki/Zen_(microarchitecture) Zen] micro-architecture and the release of the [https://en.wikipedia.org/wiki/Ryzen Ryzen] processor in early 2017, it seems that AMD can recover lost ground.
However, early Ryzen's Ryzens prior to [https://en.wikipedia.org/wiki/Zen_3 Zen 3] micro-architecture released in November 2020 have problems with [[BMI2]] performance is worse <ref>[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=32016 Ryzen Fritz Chess Benchmarks ?] by ralunger, [[Computer Chess Forums|Rybka Forum]], March 03, 2017</ref> <ref>[https://www.reddit.com/r/Amd/comments/60i6er/ryzen_and_bmi2_strange_behavior_and_high_latencies/ Ryzen and BMI2: Strange behavior and high latencies] by DonnieTinyHands, [https://en.wikipedia.org/wiki/Reddit Reddit], March 20, 2017</ref> , in particular using [[BMI2#PEXT|BMI2 PEXT]] in chess programs - one should conditionally compile using [[Magic Bitboards|magic bitboards]] instead of [[BMI2#PEXTBitboards|PEXT bitboards]], otherwise preferable for compatible [[Intel]] processors <ref>[http://www.talkchess.com/forum/viewtopic.php?t=66737&start=4 Re: Komodo 11.3] by [[Mark Lefler]], [[CCC]], March 04, 2018 » [[BMI2#PEXT|BMI2 PEXT]], [[Komodo#11|Komodo 11.3]]</ref> .
=Sponsoring=
|-
! 2003
| rowspan="710" | [[x86-64]]
| [https://en.wikipedia.org/wiki/AMD_K8 AMD K8 Athlon 64, Opteron]
|-
|-
! 2017
| [https://en.wikipedia.org/wiki/Zen_(microarchitecturefirst_generation_microarchitecture) Zen] |-! 2018 | [https://en.wikipedia.org/wiki/Zen%2B Zen+] |-! 2019 | [https://en.wikipedia.org/wiki/Zen_2 Zen 2] |-! 2020 | [https://en.wikipedia.org/wiki/Zen_3 Zen 3]
|}
* [https://groups.google.com/d/msg/fishcooking/svTzAYXesCs/_1smL5wSBwAJ Porting Stockfish to GCN on APUs...?] by [[Nick Pelling]], [[Computer Chess Forums|FishCooking]], November 18, 2018 » [[Stockfish]] <ref>[https://en.wikipedia.org/wiki/Graphics_Core_Next Graphics Core Next from Wikipedia]</ref> <ref>[https://en.wikipedia.org/wiki/AMD_Accelerated_Processing_Unit AMD Accelerated Processing Unit from Wikipedia]</ref>
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=70167 AMD BMI2 question] by Leo, [[CCC]], March 10, 2019 » [[BMI2]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=72137 Ryzen problems - AGAIN!] by [[Bojun Guo|noobpwnftw]], [[CCC]], October 22, 2019
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=72538 PEXT/PDEP are even slower than you think on Zen] by [[Gian-Carlo Pascutto]], [[CCC]], December 09, 2019 » [[#PEXT|BMI2 PEXT]]
==2020 ...==
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=73309 AMD's X3D - HBM on CPU - memory wall] by [[Srdja Matovic]], [[CCC]], March 08, 2020
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=67432&start=12 Re: Ryzen 2 and BMI2?] by [[Joost Buijs]], [[CCC]], May 18, 2020 » [[AVX2]], [[BMI2]]
* [https://www.techpowerup.com/forums/threads/amd-announces-a-red-october-zen-3-on-october-8-rdna2-on-october-28.271981/page-2#post-4344965 Re: AMD Announces a Red October: Zen 3 on October 8, RDNA2 on October 28] by dragontamer5788, [https://www.techpowerup.com/forums/ TechPowerUp Forum], September 9, 2020 » [[#PEXT|BMI2 PEXT]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=75333 New AMD Zen 3 and Ryzen processors] by mmt, [[CCC]], October 09, 2020
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=75639 Will AMD RDNA2 based Radeon RX 6000 series kick butt with Lc0?] by [[Srdja Matovic]], [[CCC]], November 01, 2020 » [[GPU]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=75691 Zen3 supports fast PEXT aka BMI2] by [[Alayan Feh]], [[CCC]], November 05, 2020 » [[BMI2#PEXT|BMI2 PEXT]]
=External Links=
