not sure but it can handel a 5850
Yeah, well I just had a Q6600 @ 3.2Ghz and a GTX 260 Core 216 running on a 6 year old Antec True Power 2.0 480W (18A on the 12V) power supply. But I just replaced that PSU with a Corsair TX650 last night. Why? Because although it "works" I didn't want the whole thing melting down and destroying everything. Pushing a poor quality, or old power supply too hard could damage more than just the power supply.