DriverHeaven posted a review on the Zalman VF900-Cu VGA Cooler

ATI's X1k series of graphics cards are certainly a powerful solution for gaming, however whether purchasing a X1900XT or the older X1800 - the coolers are some of the loudest we have heard in our labs. We made it very clear to ATI that their noisy cooling solution needed addressed in the future because this was never an issue for the 78x or 79x Nvidia boards.

Zalman VF900-Cu VGA Cooler Review