This has been going on for a while now, my PC has been randomly rebooting mainly under load from games etc.

Ive checked all the temps and there fine, all the voltages from my power supply are fine so we did a Memory test to test the 2x 1gb RAM sticks to find one was running slower that the other and were basicly completely different!

So i though bollox to all this messing about with cheap RAM and went and bought 2x matched pair corsair platinum 1gb sticks and threw them in, all seemed well until lastnight it rebooted again

Anything else i can do before it goes through the window?

PC spec:

ASRock K8NF4G-SATA2 Motherboard
AMD 3200+ 64
256mb Nvidia 7800GTX
Coolermaster 550w PSU
Sound blaster Audigy 7.1
2x 1gb Corsair platinum
160GB HDD

thats about it.