Attempt at overclocking not working

TheKnat

TheKnat

TheKnat

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Joined
13 May 2007
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Lancashire, UK
I tried to overclock the processor in my new computer and the clock seems to take. When the computer reboots I can see the new speed it should be running at, but when Vista tries to boot up, it displays a blue screen hardware error.

Spec is:
Asus P5N-D nForce 750i
Intel Core 2 Quad Pro Q6600
Corsair 2GB DDR2 XMS2-6400C4

I've read up the reviews on this processor and it should easily be able to handle the 3.0GHz clock I'm trying for, but for some reason its not. I've tried it both on auto voltage and at 1.4v (as I read somewhere), but vista won't boot.

So does this look like a hardware problem or more likely to be something to do with vista ?

EDIT: Sorry forgot to mention that as soon as I take the OC off, Vista boots fine.
 
Is the memory running at 800Mhz after you have raised the cpu fsb to 333Mhz or at 800 when the fsb is 266Mhz?

If its before then your memory will set on the 2:3 divider and be running at 887Mhz when you up the fsb to 333.

Have you tried either lowering the divider to 1:1 or changing the cas latency timing to 5?
 
It was 800 after I raised the FSB because I set the memory to unlinked.
I set it back to linked and used 3:2 and it boots into Vista, but freezes pretty quickly. The 1:1 divider setting doesn't boot at all.

I also tried setting it back to 3:2 and chaging the cas latency to 5 as you have suggested but this again resulted in no post.
 
Okay, it looks like it could just be a problem with that FSB I was using. I lowered it to 1300 (bus speed now 325) and it seems to be OK. Just stress testing it now to see it if holds up.
 
Well that didn't go to well. Ran for about 5 minutes then 2 of the tests in Prime95 died due to a hardware error. There was also an alert about the +5V being too high.

Back to the drawing board
 
If it can't do 2.9Ghz at 1.4v then I would think something other than the cpu is to blame. what about raising the chipset volts?

Also what PSU are you using?
 
EVILCOSMOS said:
Also what PSU are you using?
Click to expand...

Using a Corsair HX 620W.

what about raising the chipset volts
Click to expand...

What should I look to up them to ? Obviously don't want to fry anything.

Wiggins said:
How many HDD's, Fans and USB stuff do you have plugged in?
Click to expand...

1 HDD, 4 fans+cpu fan, USB mouse and keyboard.

I've been doing some more testing and I've set it at a lower clock speed again. Its now at 312 (1250 effective) giving a clock speed of 2.8ghz. Its been running Prime95 for about an hour now with now problems.
 
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