I plan on trying this also with my GTX465's and the Koolance GPU only block. The GTX heatsink seems to be built like a unisink that D-tek use to put out and Swiftech now puts out except for having a fan. It should keep the memory and VRM's cool enough for some decent overclocks while the water block will keep the GPU nice and cool. If you wanted to put the shroud back on you could and just cut some of it out to allow the tubing to go out the top of the card, but then that would ruin your warranty.