Which program is telling the voltage truth?

[Dangerous_Dave]

Just lobbed a 2500k into my p8z77i deluxe motherboard, and pushed it to a stable 4.95GHz at what AI suite says is 1.3V. Only trouble is, Core Temp says it's actually 1.41V. It's peaking at around 69C on prime95 with a Corsair H50. So which thing is telling the truth here?

 

[Dangerous_Dave]

Still it seems a bit surprising that an H50 could keep it to 70C running prime 95 @ 4.9Ghz if it's got 1.4V going through it.

 

[Dangerous_Dave]

Funnily enough I made the mistake of using the 'extreme' automatic overclock utility. Switched it off when I noticed the temps touching 90C - but it was hitting 5.3GHz stable at 1.45V!

 

[Dangerous_Dave]

Ok machine has gone rather screwy. It kept trying to revert to 5.3GHz at startup, so I uninstalled AI Suite and decided to use the BIOS instead. Only problem: when I uninstalled AI Suite (or about that time) the option to alter the CPU multiplier disappeared from the BIOS. So I installed AI Suite again, but now when I alter the settings on AI suite it makes no difference to the speed the CPU actually runs at. And AI Suite still thinks that the OS Default Settings for this chip should be 5.3GHz (although now it isn't actually able to make it run that).

 

[Dangerous_Dave]

And the CPU multiplier still hasn't turned up again in the BIOS. Could I have changed a setting that prevents altering the CPU multiplier?

 

[Dangerous_Dave]

Ok it was the 'turbo mode' button. Apparently you need turbo mode enabled to have any control over the multiplier. Don't really know why. Anyway, uninstalling AI Suite again - thing takes bloody ages!

 

[Dangerous_Dave]

K computer's officially on crack. I reset everything to default. What it thinks is default (no AI tuner installed) is running the chip at 1.5V.

Any ideas?

 

[Dangerous_Dave]

Also it briefly sneaks up to 5.1GHz on this 'default'