Problem with Windows Recognizing Video Cards

My Setup:
Win7 Ult x64
XFX 790i Ultra SLI

My Problem is windows isnt recognizing the 2nd Video card. So sli isnt kicking in. Its not showing up in Device Manager at all. No Red x or yellow !

The Video Cards arent bed tested them individually. and the port isnt bad because i have three and it happens the same in each. i tried a Promise raid card and its recognized in both sockets im tryin to use

Hello there,

This is kind of a long shot but have you tried looking in your bios? Maybe you have to enable the SLI feature there?

-The Digital Jedi

Also have you tried updating your drivers?

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