Okay so I've seen a lot of people posting this problem but most of them was due to the fact the memory was off. well this time i have to nvidia 460 1GB each, they are the same card, bought at the same time, on GPU-Z everything is the same but the slots they are in.
one being in PCI-E x16 @16 and the other PCI-E x16 @4, would that cause me to not enable SLI?
That shouldn't matter.
Oh but it does! Xfire will do x16 + x16, x16 + x8 and x16 + x4 but SLi will only do x8 + x8 or x16 + x16.