Why do I bsod at 4.0ghz

[rgsgww]

I am overclocking my intel qx9650 to 4.0ghz. Right now I'm at 3.6 ghz, 1600mhz fsb, multiplier 9, voltage is at 1.3v stable for over 24 hours

When I push for 4.0ghz at 1.3v, vista will not boot, when I set it to auto, I run at 1.35-6 and vista boots, but bsods when I log in.

Do you think I should loosen my fsb and push the multiplier up? Would I gain performance with a faster cpu clock than fsb? Or is it worth shaving off the fsb for an extra 400mhz?

Or should I try something else?

 

[theAnimal]

Read the How To sticky.

 

[richardscott]

if your cooling is okay then id suggest more vcore as for fsb over multi with and qx9650 id deff go with the multi first then the fsb

 

[50bmg]

read Tom's OC stickies as theAnimal suggested.

I would imagine it is the cpuv is to low. At 4G it should be higher. You will get BSODs or hard lockups with a multiplier that is to low. Same thing was happening to me with my OC. I bumped up my cpuv from 1.32v to 1.34v and all is good now.

BSODs may come from RAM issues. Make sure your RAM is set at the proper voltage. Make sure you RAM ratio is good. I set mine to 1:1. What ever it takes to get close to the RAMs rated clock as long as the ratio is not to lopsided. Read the sticky.

 

[50bmg]

I just googled "qx9650 OC voltage" and most of the info was that at 4G it should be over 1.4v. Google it and read the stickies.

 

[rgsgww]

Thanks guys, I did read the stickys. I will try a little higher vcore. My mem is stable.

My cooling is pretty good. 48-50max at 3.6 and idle 32

 

[rgsgww]

I dont think I will be able to get it up to 4 for 24/7. What I mean is, the life of the processor will be cut back very far. I need to run it at 1.43 to get it stable. A very high voltage for this processor. Strange things happened at 1.41volts, vista crashed with a "bios is not acpi computable" pushing the fsb to 1.35-.05 below the max solved this issue.

 

[jitpublisher]

Maybe, just maybe your particular CPU cannot go that far......when you start pushing that far, some will do it, and some simply will not.

 

[rgsgww]

Maybe, just maybe your particular CPU cannot go that far......when you start pushing that far, some will do it, and some simply will not.

Thats what I thought. I'm perfectly ok with 3.6 though