Well, i cant really say. It really depends on the chip. Mine took a little vcore increase to get to that but not that much. Yours may take a large increase in vcore.
This is how i would go about doing it
1.) Change the memory mhz to the lowest posible ratio.
2.) Chang the "QPI link speed" to the lowest possible setting (if you have this) it may be reffered to as the "QPI multiplier" (the lowest should be around x36)
3.) Change the uncore multiplier to the lowest setting.(should be around x14) And again, you may not have this.
4.) Start increasing your reference clock in 10mhz increments (your reference clock should start at 133 mhz)
5.) Save the bios and restart your computer. If it all works out fine then you should be able to boot into windows and log in...
If it all works fine and you dont get a blue screen then you can go into the bios and raise the refference clock another 10mhz.
6.) Keep increasing the refference clock by 10 mhz until you get a blue screen... When this occurs go into the bios and raise the voltage a little bit.
You should raise the vcore in very small increments and keep rebooting and seeing if you can get logged in without a blue screen.
you should also raise the QPI vcore in small increments.
7.) Repeat the process until you get to the speed you wanted to achieve.
And it would help us to know what mobo you are using.
my 920 d0 is running at 4.2ghz i have the xig dark knight cooler my cpu cores idle at around 42 and the high is 73
make sure your watching the voltage regulator temps on that motherboard it shouldn't be going over 85c. the voltage regulator can get very hot if not oc'ed correctly. keep that out of the 80's and your safe. i once saw mine hit 100c in prime 95
i contacted evga support about it they say it can hit 105c before failing but they strongly recommend keeping it under 85c
my vreg temp doesn't go over 80c any more after proper cooling
Message edited by cal8949 on 07-23-2009 at 11:23:58 PM