Sudhian posted a comparison review of three of the more popular VGA coolers - the Arctic Cooling Accelero X2, Zalman VF700-Cu, and VF900-Cu.

Zalman's VF900-Cu is the clear winner in this roundup. It offers the best performance and lowest noise levels out of the three coolers. The efficiency of Zalman's heat pipes and independent GPU/memory cooling keeps the GPU running at a brisk 55-57 degrees C-over 10 degrees C cooler than the nearest quieter than stock cooler.

Second place also goes to Zalman with their VF700-Cu. In its silent mode it is able to deliver lower temperatures and less noise than ATI's stock cooler. If performance is what you seek the VF700-Cu in its performance mode will drop the temps an additional 11 degrees C, although noise is increased 10 decibels.

We were most disappointed in the Arctic Cooling Accelero X2. After having good experiences with the existing VGA Silencer coolers the Accelero X2 just doesn't live up to its predecessor. Although it is quiet its performance is nowhere near as good as the Zalman VF900-Cu and comparable to the VF700-Cu but at $2-3 more. There's also the use of sticky thermal pads which are too sticky and bounds the cooler to the card-which gets really annoying when you try to remove it.