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E8400 Can't Get Above 4Ghz

post #1 of 17
Thread Starter 
Hey guys, currently trying to OC my E8400 CPU. System specs in sig, currently set on

FSB: 445
System Memory Multiplier: 2.00D (effectively 1:1)
vCore: 1.300v
VDRAM: 1.82v
CPU Temp Idle: 39, 37C
CPU Temp Stressed: 54, 54C

The rest are on [normal].

I've ran Prime95 with these specs for ~4 hrs? Mainly because I need to use the computer and wanted to over clock it further. But I couldn't get it any further without crashing =[ Any suggestions?

P.S. According to Intel's Spec sheet, E8400's vcore should be 0.8500~1.3625v, what happen if I go over 1.36v? Is it worth it?

Thanks.
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post #2 of 17
what is your FSB at?
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post #3 of 17
Thread Starter 
Quote:
Originally Posted by xmrflipflop View Post
Hey guys, currently trying to OC my E8400 CPU. System specs in sig, currently set on

FSB: 445
System Memory Multiplier: 2.00D (effectively 1:1)
vCore: 1.300v
VDRAM: 1.82v
CPU Temp Idle: 39, 37C
CPU Temp Stressed: 54, 54C

The rest are on [normal].

I've ran Prime95 with these specs for ~4 hrs? Mainly because I need to use the computer and wanted to over clock it further. But I couldn't get it any further without crashing =[ Any suggestions?

P.S. According to Intel's Spec sheet, E8400's vcore should be 0.8500~1.3625v, what happen if I go over 1.36v? Is it worth it?

Thanks.
-points-
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post #4 of 17
If you go over 1.36v you run the risk of ruining your chip.


but if your just gonna get a CPU-Z validation than go for whatever voltage doesnt destroy your motherboard.
post #5 of 17
Thread Starter 
Any suggestions to get it higher?
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post #6 of 17
Yes. Your not going to ruin your chip by going over 1.36v.. If your load temps are only 54c, you have lot's of head room. 1.36v is from intel. That's for a chip running stock clocks with a stock cooler. A stock chip with stock cooling at stock clocks will be in the 60-70c range and last for years. If your using better cooling, then don't be worried to use 1.4-1.425v if you want more. I had my e8400 @ 4.5ghz on water with 1.5v for 2 years, sold it and it's still working perfect now on air at 4ghz with 1.35v.

Try 1.3875v and see if it helps.
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post #7 of 17
Thread Starter 
Aside from the Vcore, anything else I should adjust to improve stability? (perhaps mch, or vdram?) I'm also using 2x strontium 800 2gb, 2x hynix 800 1gb RAMs. They are budget RAMs, how far do you reckon they could go? In terms of FSB and vDRAM?
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post #8 of 17
Upload a pic of your bios and then I can help
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post #9 of 17
Thread Starter 
Manual here, Gona just upload the stuffs for you.

Red means current edited value, blue is uneditable infos, the rest are just as shown. Don't remember some of the normal values sorry.. but they are just the mobo's defaults.

Thanks =]




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post #10 of 17
Quote:
Originally Posted by The Master Chief View Post
If you go over 1.36v you run the risk of ruining your chip.


but if your just gonna get a CPU-Z validation than go for whatever voltage doesnt destroy your motherboard.
thats the max VID intel will give a chip. not max volts.

absolute max as speced by intel is 1.45v

however, as also specced by intel, per a certain linear equation, as the power draw of the chip increases, max safe voltage decreases.

although at 4.2 1.45v should be all good for a looooooooong time.

hell, 1.6v VTT and 1.7v vcore didnt kill my E8500 even after 6 hours.
validation proof in sig if you are a non-believer. im using it right now to type this as well

EDIT: oh and BTW, bump "CPU Termination" to around 1.35v and it will be stable over 4Ghz
almost guaranteed. (thats VTT BTW)
Edited by wumpus - 12/29/10 at 10:48pm
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