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Best 1200w Power Supply?

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Hey everyone! I'm looking for a new computer and I don't know how big I want my power supply to be... These are going to be the specs of the computer.
Six Core 3930k
3TB HDD
256GB SSD
2 x GTX 670 4GB
64GB of ram
Asus Rampage IV Extreme Motherboard.

I will in the future have 3 GTX 670's. Or one GTX 680 in SLI with the Two other GTX 670's. The thing is, I don't want my computer to run at 1200w, if it's using for example only 900w. That's a waste of 300w! So is there a power supply, that adjusts itself to only produce enough power to power the machine. So it doesn't run at 1200w all the time? Thanks for helping me! I really appreciate it!

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Power supplies don't work like that intensity. The power supply will only provide the power that the system is demanding at the time. For example, my setup runs at around 75W idle and ramps up to 250W at load with a game, but I have a 850W power supply. It's not drawing 850W constantly, only when demanded. Hope that helps!

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Power supply Expert

Just because it's a 1200W power supply does NOT mean it draws 1200W all the time regardless of what your computer draws. It will draw marginally more from the socket than your computer draws from it. The 1200W is the maximum power it can deliver continuously with a degree of stabilty. Your system will draw roughly 500W from the power supply which translates to 625W from the wall socket assuming the power supply runs at 80% efficeincy.

I have got to say though, I'm running a 3930K overclocked to 4.2GHz with a pair of GTX580's in SLi, this draws ~660W from the wall socket. I found it was unstable with a 850W cooler master silent pro, I'm currently running it on an Antec 1200W High Current Pro, it's been stable since.
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intensityfims said:
Hey everyone! I'm looking for a new computer and I don't know how big I want my power supply to be... These are going to be the specs of the computer.
Six Core 3930k
3TB HDD
256GB SSD
2 x GTX 670 4GB
64GB of ram
Asus Rampage IV Extreme Motherboard.

I will in the future have 3 GTX 670's. Or one GTX 680 in SLI with the Two other GTX 670's. The thing is, I don't want my computer to run at 1200w, if it's using for example only 900w. That's a waste of 300w! So is there a power supply, that adjusts itself to only produce enough power to power the machine. So it doesn't run at 1200w all the time? Thanks for helping me! I really appreciate it!



I have a similar setup with a 1000w Seasonic Platinum. Believe me, you don't need a 1200w psu. My system barely pulls 500w from the wall with 2 560 448s (which draw as much or more than a 670). With 3 670s, you may draw 650w, which means a good 850w or 1000w psu will be enough even OC'd. Just make sure you get a high quality unit. They are designed to run at near capacity for long periods of time in enterprise situations. I'll probably get screamed at for recommending only an 850, but its sufficient (I really can't justify my 1000w other than it was on sale that day).

btw -- You cannot SLI a 680 with a 670 (or 2). The cards need to contain the same chip and though the 670 and 680 are very, very close, it won't work.
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