Psu strong enough?

Hey alls, I need some advice

For some time i got annoying system reboots out of the blue while gaming. Never in other circumstances.

I not even get a blue screen or a distorted screen, the system just reboots. No error in the logs apart from "unexpected reboot".

I tested all kinds of stuff, its neither overheating nor bad memory.

Im pretty sure its not the gpu or cpu as well.

So now my suspect is the psu. Do you think its strong enough?

My System:

psu: Thermaltake Toughpower 600 W
motherboard: Asus p5q deluxe
cpu: Intel Q9550 Core2Quad
gpu: XFX 275 GTX

usual hd, 2gb of 1066mhz DDR2 memory and 5 additional fans.