i've been reading a lot on OCing last two days and decided ONCE AGAIN to increase my E8600 speed to 4.4GHz... but regardless of all the changes i made in bios the part i can't change is voltage... i set ram voltage to 2.15 (from 1.8 default) which is said to be enough by all posts on Corsair CM2X1024-6400C4. and the CPU voltage that is 1.54V for 4.26GHz at the moment on AUTO setting in bios. and if i try to change it manually it doesn't reduce to such impossible voltages like 1.4.... i've read a post of a guy who has 4.40 on 1.4V... why doesn't my CPU even boot on 4.0 on 1.4V....?
Mainboard : Gigabyte X48-DS4
Chipset : Intel X48
Processor : Intel Core 2 Duo E8600 @ 3333 MHz
Physical Memory : 4096 MB (4 x 1024 DDR2-SDRAM )
Video Card : ATI Radeon HD 4800 Series
Hard Disk : ST31000340AS (1000 GB)
Operating System : Microsoft Windows XP Professional 5.02.3790 Service Pack 2 (x64)
DirectX : Version 9.0c (May 2010)
What do you mean "impossible voltages"? Try confirming that 1.54 is being fed with core temp our cpu-z.
Also, turn on "load line calibration" (reduces vDroop) and that might change things in your case. It will make the vCore more stable.
Finally, one person being able to boot that speed with 1.4v doesn't mean everyone will be able to do it. Chips are different, boards are different, etc...