Come to think of it, I agree. I remember being surprised to see the 100W rating on mine, and doing some quick math on the power demands of the computer. It was all so disappointing.
The PSU is still useable for hobby use as a steady voltage source, but I'm not sure if it would be ok to place back into a computer.
"You need tender loving care once a week - so that I can slap you into shape." - Ellyn Mustard