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Old March 11, 2009, 11:38 AM
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Default E8400 @ 3.6 P5Q-E Help

I tried overclocking my E8400 @ 3.6. It boots but it crashes due to overheat in P95 after a few hours... After running for an hour my temps for both cores are already at 61-ish. I also have an after market heatsink, the Xigmatek 1283. Help would be very appreciated and thanks ahead of time.

FSB: 400 x 9
RAM: 1000mhz @ 5-5-5-12
vcpu: 1.26
vram: 2.0
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Old March 11, 2009, 11:42 AM
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Perhaps the Intel Board folks here will help you out.....I'm sure they will :)
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Old March 11, 2009, 11:43 AM
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61C doesn't seem like a very high temperature for it to be crashing due to overheat at.

What exactly happens when your computer crashes? If you're able to run for an hour before it crashes I doubt it would be due to heat since it only takes at most a minute or two for your processor to heat up and activate PROCHOT if it's under 100% load from P95.

Maybe try increasing your CPU voltage a bit.
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Old March 11, 2009, 11:45 AM
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You can raise the Vcore up to 1.4V without any issues. Keep a close eye on the CPU temps, don't go over 70C.

I use OCCT for 2 hours to test stability.
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Old March 11, 2009, 11:51 AM
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1.4V is safe for 24/7 use on a 45nm?

I've heard a variety of voltages, some say no more than 1.365v for 24/7, others say no higher than 1.4v.
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Old March 11, 2009, 11:52 AM
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Quote:
I use OCCT for 2 hours to test stability.
Hey Charlie...is this the new version you use..as in v3.0.1? Do you run the CPU: Linpack or CPU: OCCT option?
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Old March 11, 2009, 11:54 AM
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Quote:
I've heard a variety of voltages, some say no more than 1.365v for 24/7, others say no higher than 1.4v.
Straight from Intel 1.35625v, however, my E8400 has been running at 1.45v for over a year...no ill effects "yet"..

EDIT: However, under full P95 Load it is running at 1.39v (vDrop n vDroop)
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Old March 11, 2009, 11:56 AM
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I used the OCCT option, but ever since I Fold I use a few WUs as stability tests.

As far a Volts go, I agree with RJ - 1.45V is commonly used for very long periods.
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Old March 11, 2009, 12:01 PM
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Woah, voltage does seem high. Is that what it normally takes to get the 8400 close to 4Ghz? I only question it because my E8500 is at 4Ghz, with 1.32v.
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Old March 11, 2009, 12:06 PM
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I highly doubt your crashing due to heat, while 61c seems a tad bit high for a 45nm chip at 1.26v, its WELL with in Intel specified safety limits. That said, I'd check if its mounted properly and re-seat the heatsink anyways.

What are your ambient and idle temperatures?

Also like John said, it just seems like you need to up the vcore a little bit. Don't worry, the E8400 can safely go up to around 1.4v for 24/7 operation. That said, don't jump all the way to 1.4v, go in baby steps until your stable.
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