<<
OT:Is there any way to tell the amount of watts on +5V and 3.3V once an powersupply is installed? >>
If installed properly, which you pretty much have to do, there should be a label with information showing.
On this label should have something like 3.3+5v Max xxx watts. or amps.
My Antec 300w has a box that says "180W combined" that located directly under the 3.3 and 5v amp ratings.
Hope this helps.
Edit: only 200W? well, I guess the other 310W could be used to drive some pretty big water pumps for cooling....or the compressor to the soda refrigerator next to your computer
