Sadly, my GTX460 is not reference design. The shroud is screwed onto a piece of metal that goes through the heatsink. The heatsink is similar design to the newer stock coolers for the AMD Phenom II X6 processors. If I attempt to do this mod to my GTX460, it will be completely naked short the Pump. Love this idea, and I'll keep following progress, but I can't do this mod with my GPU, better to just get a waterblock.
you can but you need to get effective cooling on your VRM mosfets.
My 560ti had a heatplate that conflicted with mounting my h60 flush against the gpu die. I therefore had to completely remove it and now my GPU is completely naked aside from the gpu block and pure copper heatsinks on the VRMs.
It was very successful for me as well as I have hit 1085 core 2250 memory maxing out at 49c and am #1 in the gf114 560ti OC club