Really hope someone can help--

I recently purchased a second EVGA Geforce 660 to run in SLI mode on my PC, but no matter what, I can't seem to get the PC to recognize it.

My Specs:

  • (2) EVGA GeForce 660 cards (the first one was previously installed and works fine
  • Intel core i7
  • 32 Gb ram
  • Windows 7 Ultimate 64bit
  • Gigabyte GA-Z77X-UD3H motherboard (latest Bios installed)
  • 1000w power supply that is marketed as "SLI ready"

What I have verified:

  • SLI bridge is plugged in (does it matter which end connects to which card?)
  • First card is in PCI-16 slot, per Gigabyte instructions
  • Second card is in PCI-8 slot per Gigabyte instructions HOWEVER the GeForce 660 literature says that the second card should go in a second PCI-16 slot which I do not have available.
  • Only one card shows up in device manager under "Display Adapters"
  • The fan on the second card is working so it looks like it is getting power
  • Card is seated snugly in the slot

What I have tried

  • I have updated the BIOS
  • I have updated to the latest (not BETA) GeForce drivers.
  • I have tried rebooting a bunch of times.
  • I have tried banging my head against the wall and cussing out loud (didn't help)

Any thoughts? Do I need to do something special in the BIOS? Any help is appreciated.

  • Is it going past POST with 2 card plugged in? Have you tried switching the order of the card on the board? Have you tried switching the SLA bridge around? is pre-os boot is it recognizing the 2 cards(Brain fart for got proper terminology? What symptoms are being displayed that allow you to confirm the 2 aren't connected? eg. device manager only showing 1 card ect... – 50-3 Sep 6 '13 at 1:31
  • Have not tried switching the cards around but will do so in the next hour. Will also try swapping the SLI cable around. And, yes--in device manager only one card shows up. Thanks. – Matt Cashatt Sep 6 '13 at 1:45
  • I have now switched the cards around. Now the new one is in the primary PCI slot and working but the old one isn't recognized--same as before – Matt Cashatt Sep 6 '13 at 2:33

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