HX1000 vs HX650 efficiency

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!
5 answers Last reply Best Answer
More about hx1000 hx650 efficiency
  1. If your looking for purely just the power bill it would be the HX650, its more efficient and is better suited for your components.

    Balance the estimated power bill savings against the outright savings from the cheaper 1000W supply.
  2. Best answer
    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.

  3. Yeah there won't be a big difference, like $1 per month max. Just like abbadon_34 said.

    EDIT: Probably more like 50 cents actually.
  4. 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$)

  5. Best answer selected by dead2k1.
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