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9900k clockspeed goes down to 4200mhz while stress testing?

 
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post #1 of 10 (permalink) Old 01-08-2020, 07:33 PM - Thread Starter
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9900k clockspeed goes down to 4200mhz while stress testing?

I'm using an asrock z370 extreme 4 and I heard that this sometimes happens when AVX offset is enabled. I followed instructions to disable AVX (turn MCE off then apparently "auto" means disabled) but it's still happening, any other ideas?

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post #2 of 10 (permalink) Old 01-08-2020, 08:10 PM
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you can't disable AVX, an AVX offset just lowers the clock speed when running a load that uses AVX instructions. using an offset of 0 stops it from clocking lower during AVX work loads and keeps it at 4.7 (on a 9900K) regardless if it's an AVX or non-AVX workload.

the only reason a 9900K should drop below 4700 (all core) is if the CPU or VRM is overheating. If neither are then it's something set wrong in the BIOS.

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post #3 of 10 (permalink) Old 01-08-2020, 08:14 PM - Thread Starter
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Thanks pook it's definitely not the cpu overheating the max temps never even hit 70c. how do i monitor the vrm temps?

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Last edited by iPDrop; 01-08-2020 at 08:22 PM.
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post #4 of 10 (permalink) Old 01-08-2020, 08:27 PM
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Quote: Originally Posted by iPDrop View Post
Thanks pook it's definitely not the cpu overheating the max temps never even hit 70c. how do i monitor the vrm temps?
If you turned off MCE and didn't unlock power limits, then it means you're being power limit throttled. Either enable MCE, set all power limits to max, or just continue to be throttled.

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post #5 of 10 (permalink) Old 01-08-2020, 08:35 PM - Thread Starter
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Not sure what was causing it but i went back to uefi defaults then reentered my settings and now its working fine. 4900MHz @ 1.33v

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post #6 of 10 (permalink) Old 01-08-2020, 08:45 PM - Thread Starter
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Quote: Originally Posted by daniel audanie View Post
If you turned off MCE and didn't unlock power limits, then it means you're being power limit throttled. Either enable MCE, set all power limits to max, or just continue to be throttled.
could you explain how i do that exactly? I see "Short Duration Power Limit" "Long Duration Power Limit" and "CPU Core Current Limit" They're all set to auto.

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post #7 of 10 (permalink) Old 01-08-2020, 09:26 PM
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Quote: Originally Posted by iPDrop View Post
could you explain how i do that exactly? I see "Short Duration Power Limit" "Long Duration Power Limit" and "CPU Core Current Limit" They're all set to auto.
You would just set them all to the max value, 4096 or something like that. This is effectively what MCE does.

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post #8 of 10 (permalink) Old 01-09-2020, 05:39 AM
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You may also need to set ICCmax to large or max value to prevent throttling/downclocking when under heavy loads (high current).

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post #9 of 10 (permalink) Old 01-09-2020, 09:13 AM
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Quote: Originally Posted by daniel audanie View Post
You would just set them all to the max value, 4096 or something like that. This is effectively what MCE does.

MCE also sets the all core turbo to the same as the single core turbo speed. Unless OP wants to run at an all-core 5.0 I'd just max out the power limits.

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AMD X4 960T Zosma @ X6 4870mhz (+62.3%)
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post #10 of 10 (permalink) Old 01-15-2020, 01:47 PM
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It's to do with your BIOS; had the same issue and couldn't figure it out.
In my case, my Asus board has: Multicore enhancement enable/disable and Auto/Bios optimised. The only way to get the clock I wanted was to ENABLE multicore. Your mileage may vary depending on board etc


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