Posted 22 June 2009 - 02:22 PM
Knowing the make/model of the computer will help with this but, if the machine uses a standard 400W ATX power supply then what you have picked on Newegg.com should be more than sufficient.
Only other reason to go higher wattage would be multiple peripherals installed inside the computer ( second hard drive, high-end video card, etc. ).
"Admire those who attempt great things, even though they fail."