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HX1000 vs HX650 efficiency

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I'm choosing between these two PSU's for my desktop. My current PSU is too weak to support my GTX 580 (been getting BSODs and artifacts).

I know either one will support the card, but I want to know, that assuming they're the same price, which will consume less power over time.

the HX1000 is only plus rated, whereas the HX650 is 80+ Gold certified.

If I'm running a GTX 580, i5 3570k, 1TB HDD, SSD, 4GB ram, off the PSU, which PSU would be more efficient and have a smaller footprint on my electricity bill?

(HX1000 I can buy off a friend for less than I can get a new HX650 for).

Thanks so much!

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Some math, some assumptions, and some generalizations. 80+ is 80% efficient under 50% load, gold is 90%. 10% of 50% of 1000w is 50w. Lets say you use the computer for 8 hours a day at this level, for 365 days. In my area of the US residential power is 5.5 cents per kilowatt hour. So 50 watts x 8 hours x 365 days x 5.5 cents per kilowatt hour is $8.03 a year, or 67 cents per monthly electric bill.

YMMV

Thanks guys, still figuring out if I need to replace the PSU I currently have anyway. If I do, I'll probably get the HX650 since is almost half the price of the HX1000 and I wouldn't be saving too much. (Because turns out my friend wants to sell his hx1000 for 125$ and I can get a hx650 for 80$)

Thanks!
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