I waited so long for some benchmarks of the R9 290x and got disappointed. The price is quite nice here (480€ for the Msi R9 290x), but the power consumption and heat output are not great. So I decided for the msi gtx 780Ti, which costs 590€. I don't like the price, but it's the best single gpu right now.
However I thought about to go with two gtx 780Ti in Sli. I also thought about to go with a single 780Ti and when the 8xx comes out (soon? maybe this year?) to sell the 780Ti and buy two 8xx's.
Now my question; will my PSU be enough for two 780Ti's ? Sea Sonic X-Series X-660 660W ATX 2.3
I looked at benchmarks and all gtx 780 Ti in Sli used 550W-650W. My problem is, I read in forums "you need at least 750W, no you need 850w, no you need 1200i Platinum XYZ..." what now? How can a 7970 or R9 290(x) in CrossFire (each something like 300W) need a 850W psu, if the 780Ti also need a 850W psu (250w draw each 780ti) ? That makes no sense for me, because the Nvidia cards are not that power hungry. I used in the past two 560Ti's well OCed (each more than 200W) without a problem. Right now I have a 7970 Matrix OCed to the limit.
Ram: G.Skill Sniper 2x8GB 1866
Motherboard: Asus Maximus VI Extreme
Cpu: i7 4770k 4,2ghz
Cooler: Corsair H80i
Gpu: 7970 Matrix
Psu: Sea Sonic X-Series X-660 660W + 80 Gold
Hope you can help me.