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amd phenom II x4 940 bios boots at 4ghz problem

post #1 of 15
Thread Starter 
Bios boots up fine. Windwos 7 goes to starting windows screen than instantly restarts the computer and keeps doing this till i change voltage, multiplier and frequency back to stable. I have my multiplier at x16 cpu frequency at 250mhz and voltage at 1.475. Any idea why windwos won't boot but bios does.
    
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post #2 of 15
because your overclock is unstable hence why windows wont load its unstable try lowering your fsb and raising your mutli also you should look in to ocing your cpu-nb
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post #3 of 15
Yea if its not stable enough to boot into windows it will likely either lock up or reboot. keep tweaking stuff and look for guides online for your mobo.
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post #4 of 15
Loading BIOS is easy, loading Windows needs more "power". CPU voltage in your case.
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post #5 of 15
I have a 940 and for 4GHz I've only been able to do with 1.525v. Try those You can also try lowering the clock a little bit.
    
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post #6 of 15
Quote:
Originally Posted by IOSEFINI View Post
Loading BIOS is easy, loading Windows needs more "power". CPU voltage in your case.
Strangely enough, my BIOS doesn't post every time with my overclock but it runs 100% stable in Windows.
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post #7 of 15
Hi,
I think you may need to increase the volts to cpu and/or cpu-nb.
Allso you may not have a 4ghz chip, thats a 1ghz overclock your looking at, the 955's ect only usually go around 600mhz oc.

My 940 i had got 3.9ghz at something like 1.58 or something, never ran it way though as it done 3.6ghz at 1.45v.
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post #8 of 15
Thread Starter 
Ok thanks for the info i will tweak it a bit more. I may jsut stick with 3.6ghz cause the heat output of my cpu with high voltage increases gets to be a bit much. What is the purpose of over clocking the nb and how will i know the safe voltage and frequency.
    
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post #9 of 15
The cpu-nb will increase teh speed at wich the memory can interact with the cpu meaning faster data transfer between the 2.

I'm trying very hard to remember what my 940 was at 6 months ago.
Sure that once i hit 2400mhz on NB anything over gave lower mem speeds, i take it this was because of teh ddr2 controller not being strong enough so i think i just kept it at 2200mhz, if i'm correct is'nt teh 940 stock NB at 1800mhz? lol my brain is like a big hole.
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post #10 of 15
Thread Starter 
1800mhz is stock nb. Ok i give up i am sticking with 3.4ghz stock voltage. at 3.75ghz the mb get's to 130+ and restarts.
    
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