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December 26, 2013, 03:48:37 PM |
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My rule of thumb is running the PSU at the same % of it's max load as how efficient it is. Example: If a 1000W PSU is 88% efficient, I would be comfortable running it at 880W all day long. Another way of looking at it is I like my at-the-wall draw to be what the PSU is rated for.
As someone else said, a 280x is ~250W. That's 1750W just for the PSUs, and I'd add another 100W or so for your MB/CPU/RAM/HD. That's 1850W.
I would say a pair of 1000W PSUs might work, but only if it's 80Plus Gold. A pair of 80Plus Bronze 1100 or 1200W PSUs would also work.
If you're planning on pushing them balls-to-the-wall OC, go for a 1100 or 1200W Gold.
And obviously only buy from trusted manufacturers. SeaSonic is pretty much the best, IMO, but you can also go with Corsair, Antec, or a few others.
Cheers.
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