Hi guys!! So I got the Aurora a few months ago (May more or less). Yeah, I know I could've paid like half the price if I had built it but I just don't have the time for it. Anyways, I got it with the radeon 5970. It didn't give me a choice as to which PSU to get, so considering I bought the 5970 (it's a dual gpu after all), I assume I got the 875 Watts PSU.
So recently I was able to save money for a second video card (another 5970) and I may need more power. My problem is this: I am not sure which PSU to get. Under techspecs in the alienware aurora website, it says under "Motherboard and Chassis Form Factor" that it has a "microATX motherboard, Mid-Tower Chassis."
Its very rare for a case to use a microATX PSU, generally its very specialized cases. Your machine will take a standard ATX PSU, but you may need to modify that little airflow guide black plastic thingy to fit a large unit in there.
Most likely there is an ATX power supply in your system. You would probably be pushing your luck with the current PSU and adding another 5970. 5870 might be ok. What resolution are you playing @ that makes you think you need a second 5970 or even a 5870 to pair with your current card? If you are playing @ 1920x1080, save your money or buy a higher resolution monitor.