I used a Swiftech MCW-50 block on my 6800GT and it works fine. The stock air cooled heatsink comes in 2 parts, one for the GPU and the other part for the memory. I removed the GPU portion and put the memory sink back. There is sufficient airflow in my case to cool the video ram with that heatsink in place.
The system is a 3/8" ID loop.
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