Seeing as how your chipset cooler is one of the kind iwth the fan recessed into the heatsink, you're going to have to replace the whole unit, which unfortunately, means you're going to have to remove your motherboard to get the old one off. But once you get your mb out of the case, removing the old one is simple. The entire unit is held on with two spring-loaded push pins, so you just turn the mb over, locate the pins and squeeze the two small tabs that project out from the sides of the pin. Once you squeeze the tabs to the pin's center, the spring will pop the pin out. Then you'll just take the hs/fan unit off the chipset.
To replace it, as mentioned, there are a host of options out there. Woodbutcher linked a very nice one at Performance PCs....the EnzoTech copper hs. It takes a 40mm fan, and for a fan, I'd really recommend the Scythe Mini-Kaze. Very, very quiet, and a lot of air flow for its size.
For a complete, almost stock looking replacement, there are a LOT of those around that'd work......
SVC has a page of them:
http://www.svc.com/chipset-cooler.html
Performance PCs has a bunch, too:
http://www.performance-pcs.com...n_page=index&cPath=197 (You're looking for one that can use the two holes your old one mounts with....either push pin style or bolt-through.)
But I really like the one Woodbutcher linked:
http://www.performance-pcs.com...=197&products_id=23200 It's not cheap but solid copper and gives you the ability to replace the fan if it ever dies again and won't leave you trying to find another hs/fan unit......just replace the fan.
And this is a link to the Scythe Mini Kaze Ultra....an outstanding 40mm fan.....
http://www.performance-pcs.com...=123&products_id=22537
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