Using easy tuner 6

oh yeah
i want someone with personal experience to answer otherwise dont bother

No. Don't bother. I have tried EasyTune on the older P35/X38/X48 boards and they just caused BSODs and/or caused Prime 95/OCCT to fail. I wouldn't recommend OCing via Windows for CPUs. It just isn't stable enough. OC via the BIOS, it's not that hard.

i read the asus rampage 2 extreme has i option in bios to oc to 3,8 or 4 GHz
what is your take on that
is that more stable

^ Even Gigabyte boards have this option. Stable? That depends on each case, but generally as long as you don't push the OC too high it should be stable on this "Auto" overclock settings.

My recommendation is to manually set all/most of the settings in the BIOS. Don't be lazy. Do some reading on this subject.

I5-750 w/Gigabyte P55-UD4P
Easytune 6 worked fine for my up to 3.8 GHz, alittle over aggresive on Vcore. which I backed off on. I reduced the Multiplier to 16 (x 200) for 3.2 GHz, but only need to up multiplier to 19 for 3.8. Prior to using ET6 I did set my memory to profile 1 (DDR3-1600.

My E6400 (W/Gigabyte P965-DQ6 - Didn't try, just to easy to set up in Bios for 3.2 GHz (Thanks in large part to Tom's forum).