Cannot enable SLI

[Faux]

I am completely baffled.

I recently bought two Gigabyte GTX460's with then intention of having them running in SLI, however after inserting them and checking the NVIDIA control panel, there's no option to 'Enable SLI'.

My motherboard explicitly says I can have 2 graphics cards running in SLI, and the manual says I can connect them with or without a bridge (Though I have tried using a third party SLI bridge as well).

I am sure both cards work as I've tried using either one alone in the first PCI slot successfully, and with both cards installed the fans/activity LED's are in operation.

Also, I'm using the latest driver version and Windows 7 64bit


Help pls?

 

[Faux]

The cards have to be connected with a bridge and have you restarted the PC?

Restarted a couple times, and the SLI bridge I have made no difference regardless of which way round I connected it (Worth noting that I had to buy it from a third party as my motherboard didn't come with an SLI bridge, nor did my graphics cards, though as I said in my original post, the manual for my Motherboard says a bridge isn't necessary?)


Device manager only shows 1 card, and here's my Bios version.

The changelogs in the Bios update page of my motherboard support section don't mention any Crossfire/SLI fixes though?
Scrap that above comment, just realized that 21/12/2009 Bios revision mentions 'Improve PCIe card/CD-ROM compatibility', could that really be it...?

 

[Faux]

Are you sure that you haven't got this version (rev 1.0) of the board:

http://www.gigabyte.com/products/product-page.aspx?pid=2989#bios

Which only gets SLI support from bios F5?

Why don’t you download and run CPU-Z it will confirm board/bois versions.

Positive, in the corner of the board it says Revision 1.6

Regardless I've ran CPU-Z and here's the results.

Also, due to my initial switching of cards ports and such, I've reseated the cards about 3-4 times so I doubt it's that the second one is loose, and I've checked around the BIOS and there's nothing regarding GPU's.

(Thank you for the all the help so far)

 

[Faux]

I had a similar issue when I tried to enable SLI with my two GTX 260s.

The second card wasn't being detected and the only way I managed to resolve that was to remove the original card and boot the PC using the new card in the second PCIE slot. When I booted with 1 card in the second PCIE slot I noticed that a PCIE bridge was detected and drivers were installed automatically for it :/

Once that was done I was able to enable SLI

Doing this worked a treat! Thank you all very much for your help, and happy new year!