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Thread: ASRock Z75 Pro3 CPU throttle problems




  1. #1
    Grim Wrath is offline Junior Member
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    Unhappy ASRock Z75 Pro3 CPU throttle problems

    Hello all, I am running the following system:
    Intel i5 2500k @ 4.5Ghz
    8GB of DDR3 Ripjaws RAM
    EVGA GeForce GTX 680 Videocard
    Corsair HX750 PSU
    HT OMEGA Claro Halo Soundcard
    HAF 932 Advanced Blue Edition case
    Hyper 212+ Cpu cooler with push/pull configuration

    Now, I'm trying to go for a stable, modest, 4.5Ghz overclock from stock 3.3Ghz. I have only changed the multiplier from 33 to 45, set turbo mode to +0.004V, set the offset voltage to +0.005V, disabled all C states except C1, and disabled spread spectrum. The problem is, when I do a stability test on Prime95 using max memory torture test, the speed is throttled down to 3.3Ghz for a few seconds, and then jumps back to 4.5Ghz. As the test goes on, the throttling increases more and more, to the point where it is throttled at 3.3 for a good 10-20seconds before jumping back to 4.5. Now my max temps with these test hover around 75 degrees C and the Vcore I get is 1.328.

    Why is it throttling the speed? What can I do to stop it? I've tried disabling the thermal throttle setting in the bios, but to no avail. Also using the latest bios.

  2. #2
    parsec's Avatar
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    Default Re: ASRock Z75 Pro3 CPU throttle problems

    If you have C1 enabled, you'll still get changes in the CPU multiplier. Have you tried your test with it disabled?

    You're not getting thermal throttling, if the CPU temps you mentioned are correct. With C1 enabled, and the UEFI/BIOS settings that are used by most mother board manufactures to enhance over clocking (setting the turbo and power timers to infinite) you'll get odd results like yours with C1 enabled. If your CPU is not overheating, then disabling C1 should fix your issue.

  3. #3
    Grim Wrath is offline Junior Member
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    Default Re: ASRock Z75 Pro3 CPU throttle problems

    Quote Originally Posted by parsec View Post
    If you have C1 enabled, you'll still get changes in the CPU multiplier. Have you tried your test with it disabled?

    You're not getting thermal throttling, if the CPU temps you mentioned are correct. With C1 enabled, and the UEFI/BIOS settings that are used by most mother board manufactures to enhance over clocking (setting the turbo and power timers to infinite) you'll get odd results like yours with C1 enabled. If your CPU is not overheating, then disabling C1 should fix your issue.
    Disabled c1. Still got the throttling. Disabled Auto Cstate package management, didn't help. Disabled speedstep as well, didn't help...Finally turned LLC from 50% to 100%, and I got a lower voltage than the other tests, strangely. 1.1272V...but hey, throttle is still happening for those few seconds at a time. Anything else I can do?
    EDIT:
    I've noticed that the wattage is around 100-115W when the CPU is running at 4.5Ghz. Maybe the fact that it's so high over the 95W TDP has something to do with it? Or is that just the 100% LLC..
    Last edited by Grim Wrath; 09-14-2012 at 12:18 PM.

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    parsec's Avatar
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    Default Re: ASRock Z75 Pro3 CPU throttle problems

    The 95W TDP is not a power rating, it is a rating of the amount of heat the CPU cooler must be able to dissipate to prevent thermal throttling from occurring. TDP stands for Thermal Design Power.

    So all of these disabled: SpeedStep, C1E, All C-State options, C3, C6, etc.

    I would set Additional Turbo Voltage to Auto, and Offset voltage to Auto, your setting may be limiting it. I wonder if your boards 4 phase CPU power is not enough.

    Are all the Long and Short Duration Power Limits set to Auto? Same for the Current Limits?

    BTW, what are you using to monitor the CPU frequency, temp, etc? If your OC settings are correct, at idle your CPU should be running at 4.5GHz.

  5. #5
    Grim Wrath is offline Junior Member
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    Default Re: ASRock Z75 Pro3 CPU throttle problems

    Sorry about not knowing too much about TDP, I am a noob. Yes, the CPU runs @ 4.5 on idle. But, changing the offset and turbo voltages to auto seemed to solve the problem until the 20min mark..Then the throttle began again. I keep my max power values at max (500). One question though. Why is the voltage LOWER when I apply full LLC? Isn't LLC supposed to ADD voltage? I'm using Intel's burntest now, faster and more thorough than prime95 I think.

    ASRock Z75 Pro3 CPU throttle problems-ekeu-png
    normal

    throttled

    Burn test says I was stable through 10 runs on "Very High" Stress level. Throttling indicates otherwise.


    Should I just lower my multiplier until it stops throttling? :\

  6. #6
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    Default Re: ASRock Z75 Pro3 CPU throttle problems

    The point or goal of LLC is to maintain a certain voltage under load, to keep it from drooping, or going down due to a high load. So it does not really add more voltage, although it may look like it does. Its purpose is to maintain a voltage, not increase it.

    A value of 500 for the max power values may not be the same as Auto, which is usually equal to no limit. A numeric value may not be the same as no limit, but we don't know exactly how that BIOS is working with different settings. I would try Auto instead of a specific value, since a value might be a limit.

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    Grim Wrath is offline Junior Member
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    Default Re: ASRock Z75 Pro3 CPU throttle problems

    Alright, tried auto with the same powersaving settings disabled as well as auto with offset +0.005 and turbo +0.004, and I still got the throttles. Temps didn't really go past 75 either. I guess it must be some kind of motherboard glitch or something. I'll probably wait for the next FW to come out and try that.

  8. #8
    parsec's Avatar
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    Default Re: ASRock Z75 Pro3 CPU throttle problems

    One thing I just noticed that seems strange, but does fit the issue of throttling, is the differences in GFlops you get during each run. For example, here is a quick run I did:

    ASRock Z75 Pro3 CPU throttle problems-ibtout1-png

    Note that my Speed does not change much at all, granted just three runs, but yours dropped by almost 9 GFlops by the third run, and dropped by almost 12 GFlops at one point, over nine runs. It looks like you have some kind of throttling after the first run or two, although you said it didn't do that, I think. I don't get it.

    When IBT checks stability, they mean how consistent the CPU is operating, and that does not mean its speed. That Results number is what is checked, it should be the same or very close on each run. If it is, that is stable. They aren't looking at the CPU speed as a test of stability.

  9. #9
    Grim Wrath is offline Junior Member
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    Default Re: ASRock Z75 Pro3 CPU throttle problems

    Speed decreases over time because the throttling becomes more and more prolonged as time progresses. 4.5 for a good 2 minutes then dip to 3.3 for 3 seconds...then it continues, with optimal speed being maintained for lesser and lesser periods while the throttle stays longer.

  10. #10
    Grim Wrath is offline Junior Member
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    Default Re: ASRock Z75 Pro3 CPU throttle problems

    So I did a little research and found out others had this throttling problem too. They contacted ASrock and got this custom firmware update that solved the throttle issues. I contacted them and gave them the link to this thread as well, hopefully they respond with a solution...

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