How much watts would this computer require?

Question

Intel Q9550

3X 1.5TB Hard Drive - 7200RPM, 32MB, Serial ATA-3

4X OCZ 2048mb ddr3 1800mhz ram

2 4870X2's in crossfire

ASUS Rampage Extreme mobo

Would this power supply by good enough?

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139006

Answer 1

that should do it

Answer 2

That should do fine.

Answer 3

I don't think a 750w power supply would be enough. If it would be enough, you'd be cutting it closer than you'd want if the CPU and video cards were all near max load. That opinion is based (in part) on data like this:

http://www.anandtech.com/video/showdoc.a...

(and other data, some of which are listed in the sources, below).

Now, the number in that web page, above, is likely measured at the wall, and the PSU is actually delivering less power than that, depending on its efficiency.  But still, I'd suggest a 1000w PSU, maybe a Corsair 1000hx or OCZ EliteXStream 1000w PSU, or even, maybe, something larger.