Not sure where you're getting "watt" in "Power Supply [Unit]," "watt" is a measurement of energy determined by multiplying volts*amperes.
I've had two failures:
Cheap no-name 350w PSU that I knew was dying but didn't replace fast enough. I bought it in like 2003 bundled with a case for $50 and it lasted about 3 years. This resulted in damage to my motherboard which killed the GeForce FX5900XT I had at the time, and also killed the Riva TNT2 I used as a temporary replacement card after replacing the power supply. All other components were left intact. My guess for failure: likely capacitor failure, due to the slow death I failed to address.
Antec TruePower-II 430w that coincidentally died the same day I received a replacement Antec TruePower Trio 550w that I now use. No damage, probably because it wasn't cheap and therefore had overvoltage/overcurrent protection. My guess for failure: I had it loaded pretty heavily and wasn't being careful, so I may have overdrawn this supply.
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