Here's another calculator. Gives some more options. Gives you another estimate.
http://www.antec.outervision.com/
That Antec calculater is a load of balls lol.
Just put in the following:
Q660 OC at 3.6ghz @ 1.45V
2 x GTX270 in SLI
2 x SATA HDD
1 x blue-ray
2 x DDR2 sticks
1 x 92mm fan
2 x cathodes
At 90% utilisation with the lowest possible aging setting....
And it said i need AT LEAST 1192W !!!!!!
I should hope a Corsair 750w would be enough to SLI 2xGTX 470s.
I don't want to pay over £100 and not have the right power supply!
Bit of thread revival!!!
I can do better, wait right there.