No, I'm saying using your specs and my suggested graphics card I just calculated an estimated power wattage output of a wee bit over 400.
So how did you get 700?
Copied from Newegg:
Pros: 1)Price less than $400 for two of these for better performance than a GTX 580.
2) Silent! Running this can and a reference 6870... This thing is silent compared to the refrance card.
3)Stays cool running at 75c while running Furmark
4)It is a Sapphire card
5)You get dirt 3 for free.
Best budget cards out there right now, Crossfire scaling is amazing with these cards.
Cons: Not OC friendly, but you dont need to OC these cards.
Other Thoughts: Get this card if you are on a budget
System Specs:
AMD 1090T @4.1 Ghz
Asus Sabertooth 990fx
8 gigs of ram @1600 (DDR3)
2x Samsung spinpoint f3 in R0... Almost the same performance as sata 2.0 SSDs (2TB total)
2x Radeon 6870 (this card and reference card
Corsair 750Watt
Bitfenix Shinobi case (Get this thing it is awesome! Not on newegg though :/)
Make sure you have at least a 700Watt + PSU.Scroll down very slightly and you'll see it when you click feedback
http://www.newegg.com/Product/Product.aspx?Item=N82E16814102948