Basically I wanted to add another 680 to my machine. I currently have a EVGA GTX 680 SC 2GB signature+. However I have been finding it difficult to find this model anywhere. Would I be able to SLI it with a different model such as the 2GB signature2?
Yes, it will work fine. I myself have a EVGA GTX 680 FTW+ 4GB and a EVGA GTX 680 Superclocked+ 4GB in SLI and I just clocked both cards the same down to the VRAM and core and such. It works great and I even have both cards underwater on the same loop with no issues.