what model psu is it? form what you said is doesn't sound like to good of one you might have 40amps of power on the 12v if it a cheep one. a good 650 will be way better then a cheep 750
It's a Dell one that came with my XPS630, but from what I can tell, it's not a cheap unit. It's been working fine so far, I'm just wondering if it can handle an extra 50-100W... though I guess it'd be best to buy a new PSU just to be safe.