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PSU ideas for SLI 660s and 8350

Hi, I just bought another 660 to SLI, and am currently using the XFX core pro 550w power supply that I already had. I'm guessing I need a new one, probably a 650 or a 750w. What are some decent/value for money PSUs at those wattages? Is the XFX core pro 750w any good? Also a couple of asides:
Should I get a modular, and are the stories about them being less efficient true?
What are the dangers involved in having an underpowered PSU?

Specs:
8350 stock speeds
Asus Sabertooth mobo
8 gb corsair Vengeance RAM
Gigabyte GTX 660 overclock edition x2 SLI
XFX core pro 550w PSU
7 answers Last reply Best Answer
More about psu ideas sli 660s 8350
  1. More than enough power and made by the Best = SEASONIC.

    Full Modualr is great and keeps the build tidy.

    PCPartPicker part list / Price breakdown by merchant / Benchmarks

    Power Supply: XFX 650W 80+ Bronze Certified ATX Power Supply ($79.99 @ NCIX US)
    Total: $79.99
    (Prices include shipping, taxes, and discounts when available.)
    (Generated by PCPartPicker 2014-05-05 14:27 EDT-0400)


    Or the Gold Certified \ Full Modular version:


    I own this one.

    PCPartPicker part list / Price breakdown by merchant / Benchmarks

    Power Supply: XFX XTR 650W 80+ Gold Certified Fully-Modular ATX Power Supply ($109.99 @ NCIX US)
    Total: $109.99
    (Prices include shipping, taxes, and discounts when available.)
    (Generated by PCPartPicker 2014-05-05 14:29 EDT-0400)

    Here it is in my setup.

  2. SR-71 what is your full system specs. You are like a god of toms hardware I have always been curious. :)
  3. I have 3 builds in my computer room.
  4. What's your main build?
  5. For a system using two GeForce GTX 660 (non-Ti) graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 600 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 36 Amps or greater and that has at least two 6-pin PCI Express supplementary power connectors.

    Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Sufficient Total Combined Continuous Power/Current Available on the +12V Rail(s) is the most critical factor.

    Overclocking of the CPU and/or GPU(s) may require an additional increase to the maximum combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock being attempted.

    XFX Pro Series Core Edition 550W (P1-550S-XXB9)
    • OEM: Seasonic
    • maximum combined +12 Volt continuous current rating of 44 Amps <===== Way more than enough to handle two GeForce GTX 660 (non-Ti) in 2-way SLI mode
    • one 6-pin and one (6+2)-pin PCI Express supplementary power connectors
    • Modular Output Cables: No
    • Official Intel Haswell Compliance: No
    • 80 PLUS BRONZE Efficiency Certification
    • 5 Year Limited Warranty
  6. ko888 said:
    For a system using two GeForce GTX 660 (non-Ti) graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 600 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 36 Amps or greater and that has at least two 6-pin PCI Express supplementary power connectors.

    Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Sufficient Total Combined Continuous Power/Current Available on the +12V Rail(s) is the most critical factor.

    Overclocking of the CPU and/or GPU(s) may require an additional increase to the maximum combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock being attempted.

    XFX Pro Series Core Edition 550W (P1-550S-XXB9)
    • OEM: Seasonic
    • maximum combined +12 Volt continuous current rating of 44 Amps <===== Way more than enough to handle two GeForce GTX 660 (non-Ti) in 2-way SLI mode
    • one 6-pin and one (6+2)-pin PCI Express supplementary power connectors
    • Modular Output Cables: No
    • Official Intel Haswell Compliance: No
    • 80 PLUS BRONZE Efficiency Certification
    • 5 Year Limited Warranty


    Thanks for the comprehensive responses, but I have a couple of questions: are you saying my 550w is fine for SLI 660s? Does the the info take into account the cpu etc, and does it account for the factory overclock? (I'm using the 660s with the 550w right now, and have been for a week. if this is a bad thing I'd like to know).
  7. Best answer
    AndyKurtis said:
    Thanks for the comprehensive responses, but I have a couple of questions: are you saying my 550w is fine for SLI 660s? Does the the info take into account the cpu etc, and does it account for the factory overclock? (I'm using the 660s with the 550w right now, and have been for a week. if this is a bad thing I'd like to know).


    I am saying that the XFX Pro Series Core Edition 550W (P1-550S-XXB9) has way more than enough capacity to power your intended system configuration with ample spare capacity to handle further overclocking of the CPU and GPUs.
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