I'm no longer getting Dual GTX 480s since the release of the GTX 580. That being said, to run two of these my power supply will need to be 1200w. Period. I'm not familiar with PSU's of this class, and would like some recommendations. Thanks in advanced.
So an overclocked i7 950 on a Gygabyte ga-x58-ud3r with 8GB PC12800 RAM in a TAF 932 with two Monster GPUs can run on a 950w? Somehow I don't feel comfortable with that. When Idle, I'm sure it will be fine, but what about full load?
I won't waste my money on 1200w PSU if a 950 can handle this on full load, but from the tests I've seen the GPUs are capable of pulling about 300w each.
Under 600 for the two cards, plus about 200W for an OC'd CPU and the rest of the system still leaves you at under 800W, which a good 850W unit can handle just fine, since 99% of the time you will be way below that, there isnt a need for a 1200W unit unless you are running 3 or 4 powerful cards.
I7-965 @ 3.75 GHz, X58 Board.
Full load 447 Watts + 280 Watts for Loaded 2nd GPU = 727 Wats /.75 (I try to shoot for max of 75% max rating of PSU = 969 Watts.
Quote GeForce GTX 580 in SLI
A second card requires you to add another 250 Watts. You need a 900+ Watt power supply unit if you use it in a high-end system (1 KiloWatt recommended if you plan on any overclocking). End Quote.
A QUALITY 850 would handle your setup, When at max load you would be at 92% of max PSU load ratings. Also Max load, ie running Furmark is generally a higher load than you will normally use.
Unfortunatly these reviews do not break-out the 5/3.3/12 V loads. The PSU ratings are going to be a good bit higher than needed on the +5/+3.3. It's the +12 V rail that is important.
RetiredChief, I have a Corsair 950w lined up. I'm flipping a coin on whether or not it will be enough. I know furmark pushes GPUs beyond what any current game would require, but the PSU usage went up pretty high on actual games for the GTX 580 ie Metro 2033.
Myself, I'd go with the Corsair 950. Corsair's are generally a great PSU. Should be under 78% of Rated power, and except for gaming you are going to be way under. While the higher wattage PSU might give more cussion at the top end it also results in a lower % utilization at "idle". Generally at the low end eff. goes down which means at 30% and under utilization waste goes up.