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Nvidia control panel doesn't give me the option to enable sli

Ok first off I have two gtx 660s connected with the sli bridge and when they are hooked up the fans both spin but only one displays an image, but when I switch cards (as in have only one in) they both work as they should.
This may sound really confusing but I've tried everything and it doesn't work, the nvidia control panel doesn't say I have sli cards, please help!
p.s. my full specs are: 750 watt corsair psu, intel I-5 3470, 16GB of ddr3 RAM, 500GB 7200rpm Hard Drive, dvd drive, msi Z77A-G45 mainboard, gtx 660
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More about nvidia control panel give option enable sli
  1. Hello... Does Windows Device Manager see and list both cards with driver installed for each one?
  2. Ironsounds said:
    Hello... Does Windows Device Manager see and list both cards with driver installed for each one?

    It doesn't but the fan is spinning, what should I do in this case?
  3. Hello... 1) You need to have the device manager look for new hardware.
    2) Update your BIO's version? there seems to be quite a few updates for Video card compatability. http://us.msi.com/product/mb/Z77AG45.html#/?div=BIOS
    3) Is there a setting in your BIO's to enable SLI? or Multi card support? PCIe x8 x8? PCIE x16 x4 ?
  4. Ironsounds said:
    Hello... 1) You need to have the device manager look for new hardware.
    2) Update your BIO's version? there seems to be quite a few updates for Video card compatability. http://us.msi.com/product/mb/Z77AG45.html#/?div=BIOS
    3) Is there a setting in your BIO's to enable SLI? or Multi card support? PCIe x8 x8? PCIE x16 x4 ?


    1). I had it look for new hardware and nothing changed 2). unable to update bios 3). no it does not have any enable sli settings
  5. Best answer
    Hello... if you un-hook the the SLI bridge connector and Boot into Windows ... Will it see both cards?
    You can have Multi video cards installed in Windows and the device manager will see/show them.
    I am not a SLI guy...
    Try a re-post with someting like this... " How do you SLI Nvidia cards "
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