Overclocking the E6750

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TJM

TJM

TJM

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I installed an Arctic Cooling Pro 7 recently and I'm experimenting with overclocking my E6750 2.66GHz on an nForce 650i Ultra.

At 3.2GHz, the system idles at 38-40 and reaches 65-68 under full load using the CPU stress test in Orthos. At 3.6GHz, it idles at 45-47 and holds at 70-72 under the same test. As I understand it, 72 (although not ideal) shouldn't destabilise the system. It has run the Orthos CPU, RAM and blend tests for a few hours without a problem.

But if I play games at 3.6GHz then the system will crash after about half an hour. It does the same at 3.3, .4 and .5, but not at 3.2 (I've had it at this speed for awhile and the system is completely stable).

What could be causing the problem? The temp difference between the clocks is minimal. Memory speed is unlinked from the CPU and all voltages are on auto. I'm quite keen to get this sorted - I won't be buying a new base unit for a year and want to squeeze as much out of this one as I can.

Edit: Probably something worth noting. The cores only hit 70-72 when running the CPU stress test in Orthos. The blend test, despite also putting them under 100% load, usually stays around 64-67.
 
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I'm using Patriot 2x2GB PC-6400, on default timings (5-5-5-15), and the PSU is an Arctic Cooling 500W that came with the case (AC's Silentium T1). I suppose neither are high quality components.
 
I have no experience of unlinking RAM from FSB, but presumably you are running your RAM at or below 400MHz at the recommended voltage.

What else are driving off your PSU? Graphics/HDD/Optical drives etc?

Reason I suspect your PSU is that Orthos appears ok for a number of hours and gaming causes crashes. This could be due to additional loads placed on PSU such as above items thus causing instability.

Could be wrong of course, but that's my read. Maybe someone else may have a different thought?

Are you able to borrow a mate's PSU to rule this out?
 
Unfortunately this case design is retarded and I'd basically have to disassemble my computer to get the PSU out (it's at the bottom of the front for some goddamn reason).

I was thinking that the power could be causing the crashes. They happen when the CPU and graphics cards are stressed - like going through a teleporter in TF2 or something.

Another problem also crops up when I OC past 3.2GHz. I can only watch videos for an hour or so before the screen goes black and the sound loops until I hit the restart button. That's quite different from the game-induced crashes, which just cause the computer to reboot immediately.
 
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