Help needed with E5200 - can't get higher than 3.15GHz..!?!

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I have an Asus P5PKL-AM motherboard, Dual-Core E5200 CPU, and a Zalman CNPS9700 cooler.

I have increased the FSB to 250MHz and successfully OC'd to 3.15GHz, but 251MHz or higher ends up with Prime95 reporting errors.

If I increase 'VCore Over Voltage' in the BIOS to +50mv, +100mv or +150mv, I still cannot get Prime95 to be error free at 251Mhz FSB.

What the hell am am doing wrong?!? :mad: I was under the impression that this should be a walk in the park even when using stock cooling.

Please help :confused:
 
Some of these E5200's suck but i think it's a vcore problem. Download cpu-z and find out what actual vcore you are running.

I am currently trying again at 251MHz FSB, everything else in BIOS set to AUTO including voltages.

StressPrime 2004 Orthos is running in the background - 6mins in, temps at 51degrees.

With this running, CPU-Z says that my 'Core Voltage' is 1.248v.
 
People have been suggesting that my 800MHz RAM might be an issue - should I try swapping this for 1066MHz?
 
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