its very simple, the hotter your system the more power it consumes:
a microwave or hairdryer easily hits 1200 Watts, so:
A desktop comp @ work: at least a 250 Watt PSU
A low range gaming comp: at least a 300 WattPSU
A Mid range comp (9800 XT, 6600 ..) a 350 or 400 Watt PSU minimum
A Highrange comp (6800 GT/Ultra) a 450 or 480 watt PSU minimum
A Superrange comp (SLi Tech) a 550 watt minimum
And be sure to have a Enermax, Thermaltake, Zalman etc PSU
and besides does the CPU run @ 52 C in windows or ingame, when you shut a game down the temperature easily lowers 10 to 20 degrees in a matter of a second, so the temp may reach the max threshold when you're in a game
