If you really want to switch to a passive chip set heatsink yes it should work, I managed to install a Zalman on my Asus A8N-SLI.
But if you have a really long video card I would recommend against it. If something is blocking airflow to it I would recommend against it. And if you care about your warranty or your motherboard temperature I would recommend against it.
But if the noise of those crappy little 40mm fans has driven you completely insane, go for it. :twisted:
The Zalman ZM-NBF47
is a better heatsink, plus it looks cooler. *Note if you can wait a few extra days Frozen CPU will ship these through the USPS for a couple of bucks.