Video card manufacturers constantly severely overrate what their cards need for power. Case in point I'm using a 9800GT with 2 hard drives, 2 DVD drives, a quad core processor, and I have a 400W power supply and 0 issues.

I've never had even close to the power video card manufacturs say is "required" and have never had a single issue. Up until I got this 400W power supply I was using a 300W for years with a GF8600GT, 2 HDs, 2 DVDs, etc, and never had an issue, and before that a 230W with 2 HDs, 2 DVD drives, etc.

See where I'm going with this?