I agree it's the components, and the quality of the power supply for it's wattage rating.
I have a sparkel 300 w/noise killer and my system (below) runs fine so far (built a few days ago).
Chad
2800+ (overclocked from a 2700+)
A7N8X DLX
GF4 TI 4600
2 Maxtor D740s
1 WD 400BB
1 Plextor 40/12/40
Floppy
3 X 256 corsair 2400 XMS (yes I know, keep it blue
--soon
volcano 7+
5" .5A fan mounted to top of case