Does the 27" iMac 3.20 have a power factor corrected power supply?

Could you explain more about what you mean by power factor corrected power supply?

The power supply in iMacs can be used with power Line voltage: 100-240V AC. Is that what you were asking?

Roger

Hi Roger,

That was what I was trying to get the OP to tell us...is this about non-US power or is it another thing?

Yes I know you just beat me to the punch. 🙂

+you just beat me to the punch+
That was a surprise.

Yeah well you young whippersnappers are just quicker than us old folk.

Probably not as young whippering and snappering as you may think.

Most computers (or just about any consumer products for that matter) do not have their power supplies power factor corrected, but unless you are running a lot of them you shouldn't have anything to worry about.

http://en.wikipedia.org/wiki/Switched-modepower_supply#powerfactor
suggests that very likely it does.

Most computer power supplies follow the current trend of providing whatever is needed as cheaply as possible. The same is true in other kinds of consumer electronics, such as audio and video equipment, and even CFL lamps. Switching power supplies don't individually have that low of a power factor to begin with, normally the harmonics and noise are relatively more of a concern (although still not that much).

That said, I don't specifically know if Apple uses power factor correction in its power supplies, but unless you are running many machines (as in larger business level numbers, which your choice of UPS doesn't indicate), you shouldn't have anything to worry about. Problems with low power factors typically involve overheating of conductors (which would be oversized or otherwise compensated for in a large office building), but you aren't going to be seeing anything like that in a residence or small office.

Energy Star 5.0 requirement (current iMacs have Energy Star qualification):

Computers Using an Internal Power Supply: 85% minimum efficiency at 50% of rated output and 82% minimum efficiency at 20% and 100% of rated output, with Power Factor > 0.9 at 100% of rated output.