Scotty! I need MORE POWER

[yogi55]

Hello again
Right now I have a 500w power supply. It works fine at delivering energy to my system that has the following;
intel pentium duo
4 Gigs DDR2 ram
Two hard drives
two DVD drives
Ge force 8800 gtx video card
recently have aquired third hard drive,would like to install it and use it for back up.I don't think there would be any problem,but would like to hear opinon from other than the guy in the mirror.

[admin]

The last I needed to calculate what kind of PSU I would I need (was upgrading the graphics card), I used this tool, which tries to estimate your current/expected usage based on a database of components and the power they require:

http://extreme.outervision.com/psucalculator.jsp