Newegg tells me that my current configuration requires 330W. Interesting. The computer was used it that config for gaming for about 2,5 years.

Power source never suffered any problems.
My PC is Fujitsu Esprimo p5600. That (case, motherboard, processor, HDD and the PSU, ~ 50 $

) stuff is very "non-standard" :

As you see, the source is pretty big and heavy

. I sometimes wondered if they wrote there a wrong number (maybe it's 450 W?)

.
Yeah, i think my equipement will keep up. Me has a 350W Feel III somewhere, just in case. I rather worry if my processor will be too slow for HD 5770.