HELP! System become unstable!

[addyngan]

I did two things today and now my system is unstable. (Prime95 giving wrong results and windows give blue screen several times).
Here's my original config which was stable (at least run prime95 for a day without error): P4 2.4C GHz, P4P800 Deluxe, 2x256MB Corsair PC3200C2.

First thing i did today was i swapped the memory with 2x512MB Corsair PC3200C2. Then I overclocked my CPU to 3GHz(FSB250MHz), and a 4:5 ratio so that the memory is still running at DDR 400. Then my system crash after like 15 minutes. (But the temperature i got from my asus probe was alright, CPU never get hotter than 45C and MB no more than 35C, so i don't think it's overheated). After that I have BIOS failure and then the video card can't give signal anymore. After clearing the CMOS and doing a BIOS flash, I am able to boot my system again with stock speed. However, now when i run prime95 and sandra together, it always crash within 15 minutes. (usually blue screen but i also see errors from prime95).

So my question is, do u think it's more possible that my new memory is bad? Or maybe i have burnt my CPU/MB during the failed overclock?

(I always turned on hyper-path for the whole time, and always use 2-3-3-6 for the memory, in both my original stable system and the now unstable one).

Feedback is much much appreciated! Thanks!!

Addy

 

[Willoughbyva]

Set everything back to stock specs. Then try a memory diagnostic program like memtest86. do a google search and it will be at the top.

 

[addyngan]

thanks for the help.
I did memtest86 and it hangs in the first test(no errors reported though).

Weird thing is now i replace it back with the 2x256 MB Corsair that gave stable performance, but memtest86 also hangs in the second test. Other tests (prime95 and sandra) runs fine with these 2 sticks though.

MB problem? Corsair memory problem?

Addy