I've stripped my Alienware M18x R2, I was goin to get a second 660m to SLI them together, on looking at the GPU there is no ribbon interface on it...am I missing something? I've checked NVIDIA website and apparently they can be bridged? Also if I didn't have a bridge would they still work, share the load kind of thing? It's stripped completely as I was curious now I'm considering just getting something bigger like a 675mx? Any help would be appreciated!