I have the same card. When it was new, I didn't like the noise the fan made, so I replaced the cooler. Here's what I used:
1. A passive cooler from an old Hercules card
2. A 40mm low speed CPU fan, screwed to the fans of that heatsink.
It's cool and nearly silent. Those 40mm CPU fans are thicker than video cooler fans, and the added thickness allows the bearings to prevent fan oscillation (buzzing).
The fact is that these cards don't require much cooling. Pick just about any video or chipset sink with the correct pin arrangement, add a fan, you're set.
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