So i am putting together a new machine and am trying to determine the best PSU to go with for this setup. All i have read about SLI's is that they need really good power support. I heard this was a great place to get feedback from people who know more than i do. So here is the build i am thinking about
Processor Intel Core i7-3770K Ivy Bridge 3.5GHz
Motherboard ASRock Z77 Professional
Graphics Card (2 SLI) EVGA 02G-P4-2680-KR
Sound Card HT | OMEGA eClaro 7.1
Fan/Heat Sync ZALMAN CNPS9500A-LED
Case COOLER MASTER HAF X RC-942-KKN1
RAM G.SKILL Ripjaws X Series 32GB (4 x 8GB)
SSD Of some Sort
So my guess is that i need a 750 -1000W PSU, but which brand.... how much, etc --- really in the woods.
Our test system is based on a power hungry Core i7 965 / X58 system.
Measured power consumption one card
System in IDLE = 144W
System Wattage with GPU in FULL Stress = 307W
Difference (GPU load) = 163W
Add average IDLE wattage ~10W
Subjective obtained GPU power consumption = ~ 173 Watts
Measured power consumption two cards in SLI
System in IDLE = 155W
System Wattage with GPU in FULL Stress = 473W
Difference (GPU load) = 318W
Add average IDLE wattage ~20W
Subjective obtained GPU power consumption = ~ 338 Watts
Mind you that the system wattage is measured at the wall socket side and there are other variables like PSU power efficiency. So this is a calculated value, albeit a very good one.
GeForce GTX 680 - On your average system the card requires you to have a 550 Watt power supply unit. GeForce GTX 680 SLI - On your average system the cards require you to have a 750 Watt power supply unit as minimum.
so a 750 watt PSU like a seasonic, corsair, XFX, PC Power & Cooling, or antec is enough. and anything over 800-850 is too much.
now i have to ask; what are you going to be doing with this? sending up a rocket for NASA?
^ As above. That system is pretty nuts. But if your happy to spend the money then go for it. The amount stated by looniam is right but if i were making a rig that intense, i would be getting reference cards and putting full waterblocks on them. I would get more than a 750 to run that ontop of the gear, and ensure its fully modular and super quiet.