Used this on a GF 5900TX and it lowered my temps 15°C. Before max OC 447 Mhz stable, after max 490 Mhz stable, after AS5 setup 500 Mhz stable. Removed two of the fan mounting screws and used 2.5mm plactic screws, nuts, washer to the mount the Heatsink through two of the four mounting holes around the GPU. Only had to demel the existing holes on the heatsink ~1mm to line up the screws. Also, placed the fan 3mm above the heatsink using longer screws and spacers this lets air move across the heatsink and memory.
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