So, I'm going to be upgrading my guest computer which contains Quad SLI GTX 480 1.5GB graphics cards. I found a super good deal for a GTX 690 4GB at $175 and I'm debating on it. Will there be a performance difference in a positive way? I am always utilizing the SLI as well, but I am aware that the GTX 690 contains two downclocked GTX 680's at 2GB per each GPU. Also, how will this perform in terms of modern games?