Topic on Glossary talk:Overclocking
This page shows the changes between two versions of a post by Mirh in the topic "Wisdom infodump" on Glossary talk:Overclocking.
You can see other versions of this post at its history page.
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'''Intel''' | '''Intel''' | ||
| − | * [https://www.notebookcheck.net/Intel-Extreme-Tuning-Utility-XTU-Undervolting-Guide.272120.0.html XTU] and [https://www.ultrabookreview.com/31385-the-throttlestop-guide/ ThrottleStop], end. | + | * [https://www.notebookcheck.net/Intel-Extreme-Tuning-Utility-XTU-Undervolting-Guide.272120.0.html XTU] <small>([https://www.computerbase.de/downloads/systemtools/intel-extreme-tuning-utility-xtu/ version] [https://community.hwbot.org/topic/172029-how-to-bench-sandy-ivy-haswell-and-broadwell-cpus-if-64x-becomes-mandatory/ notes], [https://web.archive.org/web/20190109092500/https://kallelilja.com/2018/12/workaround-xtu-attempted-to-install-on-an-unsupported-platform/ caveat])</small> and [https://www.ultrabookreview.com/31385-the-throttlestop-guide/ ThrottleStop], end. |
| − | * 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 | + | * 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 can explain "cold temperature" throttling | + | :* actually there's *even more* [https://old.reddit.com/r/intel/comments/10slejm/intel_blocks_undervolting_the_whole_story/ mess] to this story since alder lake |
| + | :* and W11, having rolled out quite the [https://old.reddit.com/r/Windows11/comments/prhdgq/undervolting_accessing_0x150_msr_is_still_not/ number] of MSR tinkering obstacles (pre-boot [https://github.com/psyq321/PowerMonkey solutions] have arisen though) | ||
| + | * [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]?) 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 | ||
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* Undervolting is probably the most no-brainer free-lunch improvement of them all, at least in ''thermally cramped'' systems (i.e. about every one that isn't a desktop with a <100W cpu) | * Undervolting is probably the most no-brainer free-lunch improvement of them all, at least in ''thermally cramped'' systems (i.e. about every one that isn't a desktop with a <100W cpu) | ||
| − | * Wherever exhaust heat of CPU and GPU is shared on a single heatsink (e.g. most laptops with a common heat pipe and fan) '''''slowing down''''' the CPU to afford more thermal boost headroom for the GPU <s>or viceversa,</s> can be a winning strategy depending on the application/game/environment. When graphics is integrated on the same chip, I'm afraid [https://old.reddit.com/r/lowendgaming/comments/ebjval/improving_gpu_performance_on_the_celeron_n4100/ only] cpu underclocking is gonna be feasible.. Otherwise with a dedicated gpu there should be plenty of utilities to lower the TDP itself | + | * Wherever exhaust heat of CPU and GPU is shared on a single heatsink (e.g. most laptops with a common heat pipe and fan) '''''slowing down''''' the CPU to afford more thermal boost headroom for the GPU <s>or viceversa,</s> can be a winning strategy depending on the application/game/environment. When graphics is integrated on the same chip, I'm afraid [https://old.reddit.com/r/lowendgaming/comments/ebjval/improving_gpu_performance_on_the_celeron_n4100/ only] cpu underclocking is gonna be feasible ("Maximum Processor State" may be lowered if lacking specialized tools, even though that's not [https://old.reddit.com/r/intel/comments/ez2c04/disabling_turbo_boost_vs_decreasing_maximum/fgm7x0i/ exactly] the most of granularity).. Otherwise with a dedicated gpu there should be plenty of utilities to lower directly the TDP itself. |