Soldato
This is what I was going to post, the numbers are simply incorrect.
Give or take the 7870 is a circa 100W card, the 7850 is more like 85W, the 7770 is 65W and the 7750 is 55w-ish. Their numbers are just wrong, completely.
The 7850 is an exceptionally high performance card for the power used and the size of the die, its more efficient than the 680gtx.
What I was about to post pretty much. Low power card yes, but not that low.


