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Cannot enable SLI

Faux

Faux

Faux

Associate
Joined
16 Jan 2010
Posts
24
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? :(
 
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simulatorman said:
The cards have to be connected with a bridge and have you restarted the PC?
Click to expand...

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...? :confused:
 
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Have you checked inside the BIOS for any advanced options that enable/disable SLI capability. Some boards have/had a dual/single GPU BIOS setting.

If you're only seeing one card in device manager, one card either doesnt have drivers installed, or isnt active. Simply put your drivers are only using one card, and are only aware of one card, which is why you have no SLI option.
 
Possible one of the cards isn't seated in the PCI-e socket properly, might want to try swapping them around too to test if ones dead or not.
 
simulatorman said:
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.
Click to expand...

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

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

tMdBQ.png



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)
 
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This is not a bios or CPU issue!

Note:-
If only one is showing in device manager that means that one card is not working!
Try one card at the time and see if the second one is working?

Edit:- Check the seating of the card an power cables!
 
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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 :)
 
Phal said:
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 :)
Click to expand...

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