I contacted you one month ago following your article entitled "Hear the sound of silence" describing the installation of a NV Silencer 3 on a GF 7800GT. So I decided to try it myself.
As expected, the Quad was noisy, almost entirely due to the GPU cooling system, after installing the Silencer 3, the Quad was again a "silent computer". But I have lost one PCI slot and not 2 as mentioned in your article.
Regarding the installation time, it took me 10 minutes, everything was provided, and the thermal past was already on the heat-pipe block.
As shown on the photo below, the 4 screws are in contact with the PCI compartment, but it does not really matter.
Regarding temperatures, the GPU is efficiently cooled down to 40°C (stable), while after 20 minutes of Doom3 it displays 49°C (temperature recorded with hardware monitor).
Results are good, and I will keep tracking temperatures over a couple of days, but it was worth doing this modification.
Indeed, with this model, one can only loose one CPI slot, but the PCI card you plan to install must not interfere with the air-flow inlet of the NV Silencer 3.
Regarding the 4 screws, add an electrical scotch tape on the PCI compartment to insulate them from the case (mostly for potential vibrations).
