Topic on Glossary talk:Overclocking
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* Well, not so fast. The Plundervolt attack made Intel recommend vendors to enable the "Overclocking Lock" flag in the bios (which, despite the name, at least on normal locked cpus just allowed for voltage control). It [https://old.reddit.com/r/XMG_gg/comments/h0wuoh/cpu_undervolting_in_bios_setup_for_xmg_and/ wasn't] a ''hard'' requirement.. but this was just the path of least resistance for most. It's not really difficult to unlock with the usual [[Glossary talk:BIOS|bios tools]], but still. | * Well, not so fast. The Plundervolt attack made Intel recommend vendors to enable the "Overclocking Lock" flag in the bios (which, despite the name, at least on normal locked cpus just allowed for voltage control). It [https://old.reddit.com/r/XMG_gg/comments/h0wuoh/cpu_undervolting_in_bios_setup_for_xmg_and/ wasn't] a ''hard'' requirement.. but this was just the path of least resistance for most. It's not really difficult to unlock with the usual [[Glossary talk:BIOS|bios tools]], but still. | ||
* [https://old.reddit.com/r/overclocking/comments/ls3yqo/help_with_understanding_bd_prochot/ BD PROCHOT] misbehaving or [https://superuser.com/questions/1465350/how-to-determine-processor-frequency-scale-down-to-200-mhz-due-to-thermstatus/#1669682 errata] can explain "cold temperature" throttling | * [https://old.reddit.com/r/overclocking/comments/ls3yqo/help_with_understanding_bd_prochot/ BD PROCHOT] misbehaving or [https://superuser.com/questions/1465350/how-to-determine-processor-frequency-scale-down-to-200-mhz-due-to-thermstatus/#1669682 errata] can explain "cold temperature" throttling | ||
| − | * For Turbo Boost to consider a core inactive this has to be [https://web.archive.org/web/20120131091738fw_/https://download.intel.com/design/processor/applnots/320354.pdf at least] in C3 sleep, so (at least on non-K cpus [https://gearspace.com/board/music-computers/465221-c1e-c3-c6-eist-speedstep-turbo-boost-core-parking-3.html#post6298060 normally]?) | + | * For Turbo Boost to consider a core inactive this has to be [https://web.archive.org/web/20120131091738fw_/https://download.intel.com/design/processor/applnots/320354.pdf at least] in C3 sleep, so (at least on non-K cpus [https://gearspace.com/board/music-computers/465221-c1e-c3-c6-eist-speedstep-turbo-boost-core-parking-3.html#post6298060 normally]?) the most extreme quests for minimum latency may end up hurting maximum few-threaded performance without some planning, core pinning and manual fine-tuning of individual per-CPU-registers. |
'''General''' | '''General''' | ||
* HPET. | * HPET. | ||
| + | |||
| + | * Operating systems might manage to [https://library.oapen.org/bitstream/handle/20.500.12657/28168/1001826.pdf?sequence=1&isAllowed=y#page=290 override] [https://gearspace.com/board/music-computers/465221-c1e-c3-c6-eist-speedstep-turbo-boost-core-parking-8.html#post10217982 some] BIOS settings, always double check from the live system. | ||
* If for some reason you need to maximize memory frequency/bandwidth (whatever the crazy benchmark or the IGP troubles above), but memory multipliers aren't granular enough, one crafty expedient is to play with the BCLK | * If for some reason you need to maximize memory frequency/bandwidth (whatever the crazy benchmark or the IGP troubles above), but memory multipliers aren't granular enough, one crafty expedient is to play with the BCLK | ||