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Which PSU with OC on CPU & SLI

I'm going to be ordering most of my rig tomorrow listed below, but am hesitant with the currently selected PSU. I know it'll do fine with 1 overclocked 670, but what happens if I decide to get another one in the future? That'll be at least 2 overclocked 670s with an overclocked 3570k Will a 650w hold out, and if I need more, how much? I'm not trying to add a lot more $$ to this already expensive build.

Here are alternatives I'm thinking of:
CORSAIR Enthusiast Series TX750 V2 750W - not modular, but my case can hide it
CORSAIR CMPSU-750TX 750W - not even bronze certified (does it matter?)
SeaSonic X750 Gold 750W
Seasonic X660 660W 80PLUS Gold

Here's the proposed build: (** I plan on adding an H100 and extra fans)
PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor ($189.99 @ Microcenter)
Motherboard: ASRock Z77 Extreme4 ATX LGA1155 Motherboard ($114.99 @ Newegg)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory ($53.68 @ Amazon)
Hard Drive: Crucial M4 128GB 2.5" Solid State Disk ($89.99 @ Newegg)
Video Card: EVGA GeForce GTX 670 2GB Video Card ($399.99 @ Amazon)
Case: Corsair 500R White ATX Mid Tower Case ($119.18 @ Mac Connection)
Power Supply: SeaSonic 620W ATX12V / EPS12V Power Supply ($89.99 @ SuperBiiz)
Optical Drive: LG GH24NS90 DVD/CD Writer ($16.99 @ Newegg)
Total: $1074.80

Thanks for any help!
8 answers Last reply Best Answer
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  1. I would go for the Corsair Enthusiast series 750w PSU just to be on the safe side of things. It's only a few dollars more.
  2. Thanks abekl, this is definitely my weakest knowledge point. I've done research and seen that you need at least 700w for an SLI, but I'm not sure which is the best buy here.

    The Enthusiast will actually be cheaper which is pretty incredible. What am I losing for upping 120w and lowering the price by $15? (they would be priced the same, but there's a 15% off discount for the Enthusiast right now =)
  3. you wouldn't be losing anything
  4. Best answer
    Tiger direct has a great sale going on not sure how long will last but here is the info: Price:$94.99 $74.99 After rebate PC Power & Cooling PPCMK2S750 Silencer Mk II Power Supply - 750W, 80 Plus Silver, 135mm Fan, SLI Ready, CrossFire Ready, Active PFC P.S. My neighbor is running x2 GTX 680 in SLI with this PSU has been for about a month now no issues. (overclocked processor & 680x2 gpu OC btw:
  5. Thanks a lot bigcyco1 - that sounds like a really good deal!
  6. shadeobrady said:
    Thanks a lot bigcyco1 - that sounds like a really good deal!
    Your very welcome! ;)
  7. Best answer selected by shadeobrady.
  8. This topic has been closed by Mousemonkey
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