I'm in the same boat as you are. I am having a heat throttling problem with my asrock board and I can't figure it out at all. First off, here are some of my parts.
CPU:
I7 2600K
Memory:
16GB (4x4GB) G.Skill DDR3 1600
Motherboard:
Asrock P67 Profess1onal Fatal1ty board
Cooling:
Corsair H70
Here's the problem I'm running in to. Heat throttling. I've tried
all available BIOS's possible for my motherboard. It came loaded with bios 1.3 though.
Now I know what you are thinking. I need to turn off all the C states and speedstepping. Well I did all that. In the OC Tweaking category of the UEFI BIOS there is a speedstepping option. I've tried with it disabled and enabled. In the Advanced -> Northbridge Category there are 4 different options that deal with the C states: Thermal Throttling, C1E, C3, and C2/C6 state options. I've tried every combination of those enabled or disabled possible with all BIOS options.
Here is what I have found out so far though.
I can boot in windows and run everything at the following CPU speeds and voltage settings with all steppings turned off.
4.4 Ghz = 1.30v @ 33C idle
4.6 Ghz = 1.35v @ 34C idle
4.8 Ghz = 1.40v @ 36C idle
5.0 Ghz = 1.48v @ 39C idle
The problem comes the moment I hit 50C temp. I drop down immediately to 4.2 Ghz. The moment I hit 55C temp, I drop to 4 Ghz. Anything over 60C drops it down to 3.9 Ghz.
It is very frustrating. Also, if everything is enabled (speedstepping and such) I idle at 1.6Ghz speed. The moment I turn on Prime95, I jump to the max speed I set in the BIOS until I reach the temps I listed above and then I start throttling.
I am thinking it's a problem with the current BIOS's for this board. I'm quite annoyed right now at this. Anyone able to think of anything I might have missed? Also I tried disabling the "heat protection" option in the hardware monitor part of the BIOS. I've tried PPL overvolt protection both ON and OFF as well.
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