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It easy to do but take your time. I spent about 2.5 hours fitting a Gelid to my GTX480 but it was well worth it & now 100% silent regardless of loading.
Well worth buying one as unlike the Zalman VF3000 the Gelid is 100% silent at all times on 1200RPM thanks to its HSF & dual low noise fans.
http://www.overclockers.co.uk/showproduct.php?prodid=HS-002-GD&groupid=701&catid=57&subcat=787