I have a new Asus PC. It has 400 watts of power. Can I run another 400 watt with it or do I have to replace it?
How do I know what will fit in my machine?
Its a risky endeavour, but if you hook up the cable properly, shouldn't be a problem. However, like my fellow replier said, I single higher wattage PSU would be better, wouldn't cost as much in money/electric bill terms.
I think I will skip the tandom power supply and find one higher power unit.
I am looking at the Radeon HD4770 because of some reviews I have read about it. I would love to get a higher power card but I don't have extra cash to spend on it.
And that's where things get expensive. A single GeForce 9600 GT isn't going to cut it if you want a 30 FPS minimum frame rate. You'll need a GeForce GTS 250 to play at 1680x1050 with normal PhysX enabled, and a GeForce GTX 260 can just handle 1920x1200. With PhysX set to High, even the GeForce GTX 260 can't handle a minimum frame rate of 30 FPS at 1280x1024, so you should consider a dedicated PhysX card if you want high resolution play (and you have a free PCI Express slot available on your motherboard).
The good news here is that a GeForce GT 220 can be had for as little as $65 online, and as a dedicated PhysX card, it will guarantee that the High PhysX setting won't bottleneck performance. Even at 1920x1200, the GT 220 produced a minimum frame rate of 36 FPS as a dedicated PhysX card. Using more expensive solutions as dedicated PhysX processors didn't produce appreciably higher frame rates, so the GeForce GT 220 is a real PhysX champion for the price.