Will a 2GB GTX 670 work with a 4GB GTX 670 in SLI? Correct me if I'm wrong, but from what I understand, it should work; however, it defaults to using the lower amount of VRAM of the two GPUs.
The reason why I'm asking is because I currently have a 2GB GTX 670, and I was planning on grabbing another GTX 670. If I did grab another one, I figured I would just go ahead and grab the 4GB model. I have a friend who may buy my 2GB model from me. If he did, I would just use that money to buy another 4GB model. And then I could run games such as Skyrim on ultra settings with high res texture mods. With my current setup, I occasionally dip in the 30 FPS range and I can definitely tell when it does. It stutters and the gameplay isn't as smooth.