What vcore are you guys using at 4ghz? mine is slightly unstable at 1.3v going to try 1.32v or so.....it seems 3.8ghz to 4ghz is a big voltage increase needed.
It will vary with each chip as some are better overclockers than others, 1.32Vcore for 4.0ghz is about right in the Bios, just up the Vcore a step at a time and test.
If you get the BSOD it will give you a error code you can check the error code below to see were you need to increase the voltage, take your time.
Common BSOD Error Codes for Overclocking
0x101 = increase vcore
0x124 = increase/decrease QPI/VTT first, if not increase/decrease vcore...have to test to see which one it is
on i7 45nm, usually means too little VVT/QPI for the speed of Uncore
on i7 32nm SB, usually means too little vCore
0x0A = unstable RAM/IMC, increase QPI first, if that doesn't work increase vcore
0x1A = Memory management error. It usually means a bad stick of Ram. Test with Memtest or whatever you prefer. Try raising your Ram voltage
0x1E = increase vcore
0x3B = increase vcore
0x3D = increase vcore
0xD1 = QPI/VTT, increase/decrease as necessary, can also be unstable Ram, raise Ram voltage
0x9C = QPI/VTT most likely, but increasing vcore has helped in some instances
0x50 = RAM timings/Frequency or uncore multi unstable, increase RAM voltage or adjust QPI/VTT, or lower uncore if you're higher than 2x
0x109 = Not enough or too Much memory voltage
0x116 = Low IOH (NB) voltage, GPU issue (most common when running multi-GPU/overclocking GPU)
0x7E = Corrupted OS file, possibly from overclocking. Run sfc /scannow and chkdsk /r
BSOD Codes for Sandy Bridge
0x124 = add/remove vcore or QPI/VTT voltage (usually Vcore, once it was QPI/VTT)
0x101 = add more vcore
0x50 = RAM timings/Frequency add DDR3 voltage or add QPI/VTT
0x1E = add more vcore
0x3B = add more vcore
0xD1 = add QPI/VTT voltage
“0x9C = QPI/VTT most likely, but increasing vcore has helped in some instances”
0X109 = add DDR3 voltage
0x0A = add QPI/VTT voltage
For a complete list of BSOD error codes that may or may not be related to overclocking visit this link.
You may also want to give this other article I wrote a read if you are wondering how to disable auto restart after a BSOD.
PS: another member put this guide up, l just copied and pasted it, so he should get the brownie points.