Power Supply's for SLI

I'm thinking about getting another gtx 680 for sli, my power supply is 700 watts. Is that enough power or do I need to upgrade my PSU? I am also willing to get a 780 as a replacement also, but getting another 680 would be cheaper.
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More about power supply sli
  1. Is it a good quality power supply? If yes, you should be fine, it looks like others are using 750 watt PSUs. If it's a no name or crappy brand then I would not recommend it.
  2. It's a thermaltake, so it's an Ok brand.
  3. I think a thermaltake would be able to hold up to SLI, but you might want to consider upgrading your PSU in the future.
  4. Best answer
    Depends on which Thermatake , most of them aren't very good.

    A good 750w would do it.

    PCPartPicker part list / Price breakdown by merchant / Benchmarks

    Power Supply: XFX ProSeries 750W 80 PLUS Silver Certified ATX12V / EPS12V Power Supply ($79.99 @ NCIX US)
    Total: $79.99
    (Prices include shipping, taxes, and discounts when available.)
    (Generated by PCPartPicker 2013-10-26 13:40 EDT-0400)
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