Originally Posted by Melee
That's a pretty huge difference, obviously.
That's much more accurate! See here:
With one 7950 under full load in their system, their PSU pulled 300W from the wall outlet. The 7950 alone pulled 138W, so for two 7950s I have to add another 138 which would then make the PSU pull 438W from the wall outlet. Their CPU was idling, so if I assume that the 4770K will pull about 150W at 5 GHz just like the 3770K does, then I can add up to 150W on top of 438W which makes the PSU pulling 588W from the wall outlet. This means that if the PSU is 90% efficient while pulling 588W from the wall outlet, then the computer is pulling 529W from the PSU. The gaming power draw could be even lower at around 450-500W or even just slightly more by a handful of watts.
Although, this is provided that the 7950s aren't overclocked all that much. I mean, if I remember correctly, then I think that if they're overclocked with a voltage increase, then these numbers go right out the window. Otherwise, the 7950s don't pull much power at all.