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Broadwell-E 6950x downclocks(under load) after Windows wakes up

post #1 of 39
Thread Starter 
Hi all,
I've been reading about this downclock happening to i7 5xxx broadwells but I can't seem to find any solution.
I'm running the 6950x at 4.2ghz. When I wake up the PC some cores run at 3.5ghz, others at 4.0ghz and there's one core that runs at 4.2ghz. These speeds are when the CPU is under load.
The system idles at 1.2ghz. When I reboot or shut down/power on everything is back to normal, running at 4.2ghz when under load. I'm using gigabyte x99-ud4 with the latest bios f22. All C states are on, turbo boost is on as well. I tried switching it off, it made no difference. I'm guessing it's either a windows thing or a bios bug(less likely). Windows is set to high performance. Are you experiencing the same thing?
Thanks smile.gif
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post #2 of 39
In this case, just wait for a new bios to be released.
    
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post #3 of 39
Thread Starter 
Yeah, I guess that's what I should to. I actually contacted gigabyte and we are trying to figure it out.
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post #4 of 39
You've tried switching all power saving features off?

Is there a system or core temperature correlation ?
     
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post #5 of 39
Thread Starter 
Yeah, OCmember, I guess all power saving options are off. I'm thinking of trying the rig with a different OS when I have more spare time.
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post #6 of 39
Quote:
Originally Posted by c0zm0 View Post

Yeah, OCmember, I guess all power saving options are off. I'm thinking of trying the rig with a different OS when I have more spare time.

I don't think it's the OS. All my cores run at 4.33GHz when the power is set to High Performance. Sometimes the software doesn't read correctly.

Try running the CPU at default and see how it acts at High, and Power savings
     
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post #7 of 39
These are Intel's first Core i CPUs that can run individual cores at different multipliers. Not surprising to see some bios versions choking on this new feature.

If you want to help Gigabyte track this bug down, run CPU-Z, go to the About tab and click on the Save Report (.TXT) button. The register that controls the CPU speed is MSR 0x199. When the CPU is loaded, this register for each core should be consistent before and after you resume from Stand By mode. Run 2 reports and compare. Let Gigabyte know if it is not consistent.
Code:
MSR 0x00000199               0x00000000      0x00002400

On my laptop, 24 hex is 36 decimal so those two digits represent the requested multiplier. Check this line in the CPU-Z report for each core. If you need to, you can use Google to convert. Just enter,

0x24 in decimal
post #8 of 39
Thread Starter 
Quote:
Originally Posted by unclewebb View Post

These are Intel's first Core i CPUs that can run individual cores at different multipliers. Not surprising to see some bios versions choking on this new feature.

If you want to help Gigabyte track this bug down, run CPU-Z, go to the About tab and click on the Save Report (.TXT) button. The register that controls the CPU speed is MSR 0x199. When the CPU is loaded, this register for each core should be consistent before and after you resume from Stand By mode. Run 2 reports and compare. Let Gigabyte know if it is not consistent.
Code:
MSR 0x00000199               0x00000000      0x00002400

On my laptop, 24 hex is 36 decimal so those two digits represent the requested multiplier. Check this line in the CPU-Z report for each core. If you need to, you can use Google to convert. Just enter,

0x24 in decimal

Yeah, the register reads 42x before and after sleep:

MSR 0x00000199 0x00000000 0x00002A00

Here's a couple of shots that demonstrate the problem. I'm not sure if the software monitor is reading incorrectly as OCmember's saying because there is a performance drop. I'm using the system for rendering and it's noticeable.
before sleep

after sleep

As you can see Core_00 is at 42x indeed, but the rest have gone nuts biggrin.gif
Thank you, guys!
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post #9 of 39
Ensure all cores are synced as it appears you are overclocking one core to 4.2GHz and the other at 4.0GHz is the Turbo Boost 3.0 core. Also, ensure that your set max TDP or max current settings aren't limiting you.
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post #10 of 39
Thread Starter 
One more thing, the problem is still there even if I explicitly set each core to 42x in the BIOS. I've even tried with Turbo set to off, but it keeps reverting some cores to 35x. No matter what I do Core_00 is the only one that retains its multiplier.
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