Nvidia nforce 680i sli wont run in sli

[Salty_Gran0la_Bar]

My evga nforce 680i sli mobo doesn't seem to want to run in sli for some reason. Whenever I put two graphics cards in the PCIEX16_2 and PCIEX16_3 slots and connect them via my asus sli bridge, it says that it only detects one graphics card in the two slots. I have tried putting just one gpu in either of the two pcie ports to test if it was just one of the ports that was broken so it was only detecting one card, but both of the slots were outputting a video signal separately. When they were put together, it only detected one of them. When I went into the bios, it said that it didn't detect sli ready ram but I checked some forums and people said that sli ready was just a sticker that companies place on their ram to make more money out of you and it doesn't make a difference.
CPU - Intel core 2 quad @ 2.66 ghz
GPU - Geforce gtx 480
Mobo - EVGA nforce 680i sli
Ram - 8gb
PSU - EVGA modular 650w 80+ gold
Cooler - Coolermaster Hyper T2
Bios - Phoenix legacy award bios version 6.00 PG
Thanks

 

[Mousemonkey]

Is that one of the 680i boards with three PCIe slots? If so then use slots one and two.

 

[Salty_Gran0la_Bar]

Is that one of the 680i boards with three PCIe slots? If so then use slots one and two.

I've tried that but when I do that, I get this error (btw, I'm quoting this straight from the boot screen, I don't speak in broken English). "The second graphics card detected in PCIE X16_3 SLI slot please move to PCIE X16_2 slot for non SLI operation."

 

[Mousemonkey]

Of the three PCIe x16 slots only the one closest to the CPU and the next one along can be used for SLi, if SLi does not work with the cards in those two slots then the motherboard is broken.