About two weeks ago, I purchased two GTX 670 FTW+'s from a guy on eBay. About a week later, I receive both cards, and both are in perfect condition. However, they came with water blocks on them (I knew this at the time of purchase) and was only able to put one card in my system, as I had to order the correct bridge (the one shipped was too big). Now, I have the correct bridge, and as far as water cooling goes, it works just fine. I turn Windows on and GeForce Experience, GPU-Z, and everything else sees both cards. However, in the Nvidia Control Panel, there was nothing about SLI in any of the options. I even had my friend with dual GTX 480's look at it, and he had no idea. I have one SLI bridge connecting the two cards, and both cards work just fine individually, but no SLI option. Am I doing something wrong?