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Updated BIOS on M7F Results in Higher VCore and Temps

Limabean
Level 7
I just updated the BIOS for my Maximus VII Formula from ver. 0501 to ver. 2012. I'm running a 4790k CPU. I haven't tweaked anything or changed anything else. With the previous BIOS, the VCore was 1.164 volts. That resulted in a maximum temp while running Prime95 of 70 degrees. Now, the VCore is 1.266 and I'm getting a maximum temp of 80.

Why would the new BIOS raise the VCore by that much with no other changes made to the previous settings? Is 1.266 volts too high?
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4 REPLIES 4

Limabean
Level 7
Well, I just tried manually entering 1.164 volts in the BIOS for the CPU core voltage and ran Prime95 again. This time, the maximum temp was about 70 degrees at 4.4 GHz. When I run CPUID's HWMonitor, it has an entry for IA at 1.194 volts. Previously, when the CPU core voltage was at 1.164 under BIOS 0501, HWMonitor had an entry that said IA "Offset" at zero volts. Should I be concerned about this? I didn't change any offset in the BIOS. I just manually entered the core voltage. The CPU is throttling correctly in terms of clock speed under no load, but the core voltage seems stuck at 1.164 where previously it would lower under no load.

Limabean
Level 7
Sorry to keep replying to my own posts, but I think I've solved the problem. I have no idea what I did, except maybe clicking my heels together three times may have helped. The CPU voltage is now maxed at 1.164, and it throttles down when not under load (along with the clock speed).

Nate152
Moderator
Hello Limabean

it seems you're getting it where you want it. You must have switched to adaptive or offset mode to get the voltage to throttle.

Good job on figuring it out.

Thanks for the reply, Nate. I didn't switch to adaptive or offset mode. At first, when I enabled XMP to get the correct DRAM timings, the BIOS set the higher CPU core voltage. I kept switching between XMP and Auto and rebooting, and eventually the DRAM timings stuck and the core voltage was reduced. I have no idea why, but it's working!