And power use does not depend that much on your PSU, but on what it's powering. A 1KW unit and a 500W unit use the same amount of electricity (assuming their efficiency is identical) if they power the same rig.
Look at efficiency.. that's what matters most. And also, a few % difference is not that big a deal.
If you get a more power hungry rig, replace some light bulbs with those power saving things... that'll offset it
Not cheaping, but don't want to spend too much... err.. ok
I gave you some suggestions before. Nicely priced (below $300) is the 850W Silverstone. This is the one K|ngP|n used when he set his latest world record 3DMark06 (with an X6800 and SLI 8800GTX's). Thus, that one definately has the beef.
The wattage rating on PSUs is the maximum output, so it doesn't consume that amount of electricity. If your comp requires lets say 500W to operate, a 1kw PSU will still only use 500W to power up your system.
I would say it depends on the rails, if they are a low amperage on per rail I would be wary. However on PSU's say like mine it has 22A per rail which is a decent amount vs say having 12a to 15a on a rail.
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