prime95 stable but bluescreens

[antych]

I got this hardware recently and been playing around with overclocking.

Intel Core 2 Duo E6750 2.66GHz
Gigabyte GA-P35-DQ6 iP35
2x Corsair 2GB Kit (2x1GB) DDR2 800MHz/PC2-6400 XMS2

I reached stable 480 fsb which gives me 3.84 from 2.66GHz
I considered it stable as I run prime95 for half day.
But to my surprise today I got a bluescreen with somedriver.sys.

I've been overclocking for ages and I never had a situation where cpu would look rock solid in prime but the system would crash this way, so I'm thinking if this might be because I changed hardware without reinstalling the system.

I had Asus A8R32 Deluxe, everything looked smooth when I switched but what's your opinion?
It takes hours to verify stability and encounter a error like this so maybe you can give me some hints, did you encountered such behaviour on similar hardware?

 

[MarcVenice]

Could be ram though ? 480fsb with 1:1 means your ram is running at 960mhz, thats a good 160mhz higher then it's stock speed. Run memtest I suppose. Or simply try an FSB of 400-459 and really loosen up the ram timings?

 

[antych]

I tested ram before at 1000MHz, was running fine, but I didn't do that for very long.
Prime95 is stressing the ram too AFAIK. I set it to use over 1.5GB of memory.
Anyway I'll try doing a full memtest from boot cd, see what happens.

 

[Acanthus]

could be ram, not enough chipset voltage, or PWMs overheating over time.

 

[stardust]

Lower CPU multiplier and see if problem still occurs. If so, it's probably a memory or chipset issue.

 

[SerpentRoyal]

Prime does not guarantee system stability. Back-off 50-100MHz and check for general system stability.

 

[myocardia]

Originally posted by: SerpentRoyal
Prime does not guarantee system stability. Back-off 50-100MHz and check for general system stability.

Very true, but I'd just like to add this: when you lower your overclock 50-100 Mhz, don't change the vdimm, vcore, or memory timings, and you should be just fine.

 

[taltamir]

wait wait wait... you swapped motherboards without reinstalling windows??? then yea thats almost certainly why you are blue screening

 

[antych]

I lowered fsb few notches down as I had one in game crash. It's probably running on the edge.
I had more luck with prime95 in the past, it always good indicator of stability.
Is there something better? Seen some people using SuperPi.

What's the best suite to really stress it out?