Topic on Glossary talk:Central Processing Unit (CPU)
This page shows the changes between two versions of a post by Mirh in the topic "AMD hidden shenanigans" on Glossary talk:Central Processing Unit (CPU).
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* Bulldozer has [https://web.archive.org/web/20131007224201/http://www.xtremesystems.org/forums/showthread.php?286448-The-Book-of-Bulldozer-Revelations-Episode-2-(SuperPI-x87) crippled] x87 performance <small>(there are no public errata regarding the feature, so this might be all free real estate?)</small> | * Bulldozer has [https://web.archive.org/web/20131007224201/http://www.xtremesystems.org/forums/showthread.php?286448-The-Book-of-Bulldozer-Revelations-Episode-2-(SuperPI-x87) crippled] x87 performance <small>(there are no public errata regarding the feature, so this might be all free real estate?)</small> | ||
| − | * Possibly every architecture before Ryzen [https://www.overclock.net/forum/10-amd-cpus/1499562-undervolting-editing-p-states-piledriver-using-amd-mrstweaker-mini-guide.html could hit] the TDP ceiling before even reaching the maximum frequencies <small>(unclear whether this couldn't just be specific to some motherboards and/or workload though)</small> | + | * Possibly every architecture before Ryzen [https://www.overclock.net/forum/10-amd-cpus/1499562-undervolting-editing-p-states-piledriver-using-amd-mrstweaker-mini-guide.html could hit] the TDP ceiling before even reaching the maximum frequencies <small><strike>(unclear whether this couldn't just be specific to some motherboards and/or workload though)</strike></small> |
| − | * Steamroller CPUs | + | ** this is probably just [https://www.tomshardware.com/reviews/fx-8150-zambezi-bulldozer-990fx,3043-8.html Turbo Core] (whatever its [https://www.guru3d.com/articles-pages/amd-fx-8320e-processor-review,3.html versioning]) being dynamically adjusted according to the current load. It can be fooled then, and some OEMs may actually be doing this from the firmware ([https://forum.ixbt.com/topic.cgi?id=9:68421 ''Turbo CPB''] and [https://fcenter.ru/online/hardarticles/motherboards/37219-Gigabyte_G1_Sniper_A88X_plata_Socket_FM2_igrovoj_serii_G1_Killer#05 ''Turbo Performance Boost Ratio''] being some likely names?). Or at least I can't explain why else the same CPU getting [https://overclockers.ru/lab/show/77524_3/obzor-i-testirovanie-processora-amd-athlon-x4-845-v-ispolnenii-socket-fm2-znakomstvo-i-njuansy-razgona downclocked] for clear [http://oc.jagatreview.com/2016/03/hands-on-review-overclocking-athlon-x4-845-carrizo-murah-tanpa-igp/4/ TDP reasons] would be reported elsewhere [https://www.reddit.com/r/Amd/comments/bcsppb/athlon_x4_845_sustained_allcore_turbo_and_is_it/ happily running] dozens of watts above the official limit. |
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| + | * Steamroller CPUs [https://www.overclock.net/forum/10-amd-cpus/1588994-disabling-igpu-usage-induced-cpu-throttling-geapm-steamroller-apus.html are throttled] when their iGPU is in use <small>(which seems a pretty common scenario for every "low budget gamer", but of course you would have to first be CPU-limited to even hope for an improvement)</small>. [https://www.overclock.net/forum/10-amd-cpus/1460028-amd-kaveri-a10-7850k-overclock-guide-125.html Alternatively] if a modded BIOS isn't available, editing p-states and disabling [https://community.hwbot.org/topic/83268-the-official-asrock-fm2-a10-oc-competition-thread/page/2/#comment-258042 APM] should be enough. | ||
* funnily enough, this [https://setiathome.berkeley.edu/forum_thread.php?id=73431 didn't seem] to happen at least on the oldest bobcat apus, and it was somewhat holding down GPU performance | * funnily enough, this [https://setiathome.berkeley.edu/forum_thread.php?id=73431 didn't seem] to happen at least on the oldest bobcat apus, and it was somewhat holding down GPU performance | ||