I have a Gigabyte GA-P31-ES3G board, Intel P31 based, with an E5200 cpu. Have tried F4, F6, F7a BIOS.
My problem is that when I set voltages to manual and up the vcore, say from the stock 1.25 to 1.35, though it shows in the BIOS Health screen, in Windows it is just gone. Back to 1.25, according to cpu-z and Gigabyte Easy Tune 6. Intel Burn Test, using Linpack, produces the same heat, around 52C.
I have C1E and EIST disabled.
Should I assume this is a Gigabyte BIOS issue, or could some setting or Intel driver in Win 7 32 and XP Home 32 be doing this?