So i'm looking to make the transition to Liquid cooling, and recently upgraded my video card to this. I know it uses a 680 PCB, but will it matter if it's the 4Gb card vs 2Gb? I'd like to not purchase the wrong part. I really haven't been able to find a difinitive answer so far. Also, is it necessary for a full coverage plate or is just the GPU type needed. Thanks in advance.