Will using, say, a 1000W PSU hurt? Is too much a bad thing? I already ordered it.
you will lose a tiny amount of power efficiency (probaby 2%) but aslong as your power price per KwH isn't stupid it wont make too much of a different.
Which 1000W did you order? i just replaced my old psu with a RM1000 and it made a huge difference
as an example, 2% * 1000W = 20W an hour
in a year you would be using an extra 175.KwH which even at $0.20 per KwH its only an extra cost of $35
so yes its $35 a year more expensive but your psu is under less stress and in theory should last longer
For people wondering about what size psu to buy, this might be confusing.
Just because you bought a 1000w psu does NOT mean it will be using 1000w. Too much power is never a bad thing. In fact, if you buy a 1000w but your system only draws 500w, it could be more efficient than getting a 600w since some models perform best from 40-60% load.
I'd say in general for most 80+ Gold and Platinum's, they perform best around 50-85% load depending on the model(There are many variables). My 6xEVGA 750Ti FTW rig pulls 530-540w mining regular scrypt which puts me around 82% load on my Gold certified 650w. It's a bit higher than I'd like but I believe my psu only drops 1% in efficiency when compared to 75%.