I used a Zalman vf700Cu on a 7600GT, and it was inaudible above other fans in my case, even on the 12v setting. The vf900 should be similar.
The Thermalright takes a lot of space, and you need good case airflow.
The Accelero looks louder than it might be, but I don't think I'd choose one.
------------------------------There is ALWAYS a drone. Exactly where, or how many drones you will encounter may vary, but that there will be at least one will not.
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