Originally Posted by Overclocker.Monster
Not tricking anybody dude, what about between 1000w bronze and 850w gold? which will be more convenient option for just 1 video card?
I'm just needing a replacement but I don't want to pick something the it wont be ok for my setup.
Let's ignore the 80+ Certification for now. The best way to approach this is to look for good, quality-made PSUs. Unfortunately, it's impossible to judge PSUs on the market, so you have to know which ones are good and which ones are bad. Here's a list, but it's incomplete:
Anyway, again, for the kind of setup you're talking about, a minimum of 900-950 is what I found in my calculation, and 1000+ is what I would recommend.
With only one 7990 under full load in their system, their PSU pulled 498W from the wall outlet. Their CPU was idling, so I have to add about 150W for the 2500K under full load at 5 GHz. So together, that makes the PSU pulling 648W from the wall outlet. Their 7990 pulled 389W by itself, so adding 389W makes the PSU pulling 1037W from the wall outlet. This means that if the PSU is 90% efficient while pulling 1037W from the wall outlet, then the computer is pulling 933W from the PSU. Your gaming power draw will be lower at around 800-900W, so that's why I'm recommending 900-950W for the minimum and 1000W+ as a recommended capacity.