PSU Crossfire Question

[Khrest]

I have a Corsair HX620 PSU and plan on upgrading from my single 5850 to Crossfire. Am I okay with the PSU for that amount of power? The rest of my specs are in the sig.

I also will have to use a couple of molex adaptors for one of the cards as the PSU only has 2 six pin PCI-E connectors.

 

[Khrest]

Cool. I was reading up on the net where it said you should have 55-60amp on the 12v rail and the HX620 is only listed as 54amps for all three rails.

However, I just put a meter on my wall socket and the spec below is drawing around 95w at idle in Windows and only around 200w running Unigine (0.81A). I was asleep in physics when we did electricity but that sounds low compared to some of the stuff I read online; or is the Corsair just a good efficient supply?