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SEASONIC X660 VS X750

My gaming computer has a Seasonic X660 gold power supply which I've had for about 6 months. I wanted to upgrade it to run SLI with 2 448's. Newegg had the Seasonic X750 on sale so i bought one. I figured i would unplug everything since it's fully modular, put in the X750 and plug all the wires back in, that way i wouldnt have to take out any of the wiring. Here's the problem. The X660 has 9 pins across for the lower mobo connector and the X750 has 8. Im holding a flashlight and going WTF? I noticed the X750 has a plastic frame around the connectors where the X660 does not. What is going on here? Do i need the X760? They have an X650 and X660, also an X750 and X760. Im lost. This was supposed to be an easy upgrade. I really wanted to get the X850 but it's $200 bucks.

I know the quick answer is to change out the motherboard wire, but still it bothers me.
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More about seasonic x660 x750
  1. The Seasonic X660 has 54A on the 12V rails and four 150W 6+2 pin PCIe; it is sufficient for running your system with two GTX560ti 448s.
  2. Rugger said:
    The Seasonic X660 has 54A on the 12V rails and four 150W 6+2 pin PCIe; it is sufficient for running your system with two GTX560ti 448s.

    The X660 will run them at stock speeds but cuts out if i overclock.
    I looked at some unboxings of the X760 on youtube, and sure enough, it has the same wiring connector as the X660.
    Apparently there was a design change.
  3. Best answer
    I almost said something about OC but didn't because you didn't mention it...I thought that it would handle some OC but if you're getting shutdowns, then you need some more juice. Personally I'd swap out the cables instead of buying the X760...avoid any shipping/re-stock fees.
  4. Is it really cutting out or are you just concerned it will? I run a 2 560 448s and a 3930k and pull less than 500w from the wall. All oc'd (the 560s about 10%). I don't overvolt though.
  5. Temile said:
    Is it really cutting out or are you just concerned it will? I run a 2 560 448s and a 3930k and pull less than 500w from the wall. All oc'd (the 560s about 10%). I don't overvolt though.

    it cut on once running unigine heaven 2.5 at stock speeds.
    it cut out in 3dmark11 when i tried to o/c to 900mhz.
  6. Rugger said:
    I almost said something about OC but didn't because you didn't mention it...I thought that it would handle some OC but if you're getting shutdowns, then you need some more juice. Personally I'd swap out the cables instead of buying the X760...avoid any shipping/re-stock fees.

    im running:
    phenom II x 4 970be @ 4.0 ghz
    990fx motherboard
    2 x 4 gb ddr3 @ 1600
    2 Evga 448 Classified Ultras; default is 810 mhz.

    one card will o/c to 950mhz, with 1.150mv, and 2200 on the memory. voltage is maxed.
    it will go to 960 or 970mhz, but thats it. 980 will crash.
  7. Best answer selected by somenut153.
  8. I'd like to thank everyone for their input. Newegg actually had the X760 on their site at one time but was de-activated for some reason. The X750 is actually the older version.

    On a side note, I just got an Evga GTX 560se for my eMachines and it is amazing.

    Thanks again.
  9. Glad I could help! Enjoy your X750 - awesome PSU!
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