750W PSU for 650W UPS?

[mental2013]

My UPS is rated at 650W output. Is it possible to use a 750W PSU?

 

[Mr5oh]

What are your computer specs? Odds are pretty high unless its a SLI or Crossfire setup you won't be drawing more than 300-350 watts from the PSU.

So it should be OK.

 

[mental2013]

What are your computer specs?

Have bought the following:
Intel Core i7-3930K 3.2GHz 6-Core
Asus P9X79 WS SSI CEB LGA2011
Corsair Vengeance 32GB (4 x 8GB) DDR3-1866
Samsung 840 Pro Series 256GB 2.5" SSD
Western Digital Caviar Black 1TB 3.5" 7200RPM
AMD Firepro W7000 Graphics Card

Have yet to buy the following:
PSU, Cabinet, Cooler, and Writer.
Thanks

 

[Someone Somewhere]

The PSU rating is the maximum power draw of the components running off it - you aren't likely to get near 750W with that. You could go for a good 550W one I expect.

To get the input power of a PSU from output, divide the power usage of the components by the efficiency. E.g. 500W of load at 80% efficiency is 500/0.8=625W. Suggest you get a relatively high efficiency PSU with a good power factor (because UPSs are rated in apparent power (VA), not true power (W)).

 

[mental2013]

Thanks for the info Someone Somewhere.