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No throttle with OC...

post #1 of 12
Thread Starter 
So, something strange has occurred. I was running my 2600k, on an EVGA Z68 FTW, with a mild OC(4.5ghz) for a long time without issue. I upgraded my RAM and after setting it up, I was not 100% satisfied that, @2133mhz, that it was stable. I finally got some errors on P95 and decided to flash the BIOS to the newest version.

At optimum settings, the CPU throttles up to 3.9ghz and back down to around 1.3ghz at idle. After tinkering with clocks and voltages on the CPU and RAM, I got her stable @4.6ghz w/ around 1.3 volts. And memory @2133mhz w/1.58 volts. BUT, the damn thing won't throttle down at idle. I have always kept power saving options turned on. I don't want my CPU that high all of the time. And now with this new BIOS flash, it doesn't seem to want to throttle down, after Overclocking it. No matter what the OC is, it won't throttle down.

Any thoughts?



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post #2 of 12
Enable C1E state in Bios and the CPU will clock down during idle.
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post #3 of 12
offset voltage?
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post #4 of 12
Quote:
Originally Posted by mtbiker033 View Post

offset voltage?

Even if its set to Manual or Fixed voltage, the clocks will drop during idle with C1E enabled but the vcore will stay relatively the same during idle or full load.

With Offset, the clocks and the vcore will drop.
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post #5 of 12
Thread Starter 
C1, C3, and C6 all enabled already. I guess I should have been more thorough when stating that all power saving options were enabled.

I am starting to think that this R22 BIOS flash borked my mobo. I have never had a single BSOD, until now.

Basically, I took note of all of my settings before the flash. Implemented them, after the update and now, I'm either not stable or can't throttle down.

Note, when over clock is set, OS does not show the CPU min max in power saving options. Is there something I can change in the registry to force this? It does show while using optimized settings in BIOS. Its as if the OS is ignoring theb Cx stated reported by the BIOS.

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post #6 of 12
Have you checked the Windows Power Options and make sure it is set to Balanced power plan and not High Performance? This may be causing your CPU speed to run at boost / OC speed the whole time.
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post #7 of 12
If Min / Max are not showing up in the Windows power options, that usually means you or the bios has disabled EIST / SpeedStep. Some motherboards do this as soon as you start overclocking. Even if you enable EIST in the bios, the bios might see that you are overclocking and over ride your EIST setting. It will then do you a favor and turn EIST off in the background before you boot up.

The good news is that if you have C3/C6 enabled and they are actually working, you don't need EIST enabled. Your CPU will be saving power just fine when lightly loaded. Run RealTemp T|I from my sig and you will be able to see if these low power C States are working. A CPU core can spend over 99% of its idle time in C6 and when it does this, the CPU MHz reported by CPU-Z becomes a meaningless number. Many utilities do not follow the Intel recommended monitoring method so they ignore when your CPU uses the low power C States. CPU MHz without reporting any information about the C States is only telling you half the story of what your CPU is doing when idle. Not even half the story.

RealTemp tells it like it is. With C1E/C3/C6 enabled, your CPU will be consuming the same power at idle whether EIST is enabled or not. Most people don't have a good understanding of what their CPU is doing when idle because CPU-Z has chosen to keep things simple by ignoring the low power C States. You can also check out ThrottleStop if you want to see what the individual threads in your CPU are really doing. Software that shows your idle CPU sitting at a fixed frequency when idle can be highly misleading when the C States are enabled.
post #8 of 12
Thread Starter 
^Thank you for your detailed and thoughtful response. I will admit, my knowledge is pretty limited here. So, I didn't know that power usage would still go down, even if the frequency was reporting high. I have RealTemp, HWinfo, CoreTemp, and various other programs to check out temps and voltages.

Is there going to be any tangible difference in power usage and temp, while having a constant high frequency, vs having an idle state and max state?

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post #9 of 12
Run RealTemp T|I or ThrottleStop so you can confirm what C States your CPU is using. Individual cores can go into the various C States and the entire CPU Package can also go into the deeper low power C States. You can not depend on your settings in your bios because not all bios versions work correctly. Some boards have been known to disable various C States as soon as you start overclocking. Making sure that your CPU cores are spending 99% of their idle time in C6 or C7 if supported is the easiest way to minimize power consumption and idle core temperatures.

cSqaF22.png
Edited by unclewebb - 3/23/14 at 9:00am
post #10 of 12
Thread Starter 
Thanks again for the info. I will install the version you have linked and check the power states and report back my findings.

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