How much power does 3870xfire draw?

[Mech0z]

I am going to buy a Q6600 and overclock it to 3.4-3.6 and get a one 3870 for starters, but how much power do they draw when overclocked? Right now I am going to get a a Corsair HX620W and I want to add another HD3870 later which I also want to overclock, but do you have any numbers on how much those cards draw overclocked and in crossfire?

My initial system before I go Xfire

[Babrbarossa]

They only draw just over 100w each at max load, so you're fine with that PSU- it's a good quality unit. I'd say you'll definately be under 400 watts with your system