This is somewhat theoretical, somewhat practical, and definetely very cool if it can be done. I have a new SLI setup with an A8N-SLI and 2 BFG 6800GT PCIes but have not yet set them up (waiting for the long weekend in just a few days) and I am almost positive it is going to be louder than heck. I hate listening to my computer already (I have a T-bird 1.4 and the fan sounds like an airline jet). So would it be difficult to setup an SLI watercooled rig? I was looking at perhaps two DangerDen NV-68 waterblocks for the cards and a TDX for the FX-55. One thing that keeps holding me back, though, is the fact that my warranties will be no more.