Thermalright XP-90C Heatsink
 

Weight is obviously a concern with a copper heatsink. According to
Thermalright's website, the original XP-90 weighs 360g and the XP-120
weighs 370g, while the copper XP-90C is a hefty 690g. These figures are
all without fans, of course. Despite the extra weight, I'd be confident
moving a PC around with this cooler installed. The retaining arms are
extremely unlikely to pop off if installed correctly and the load is
spread evenly across them. If you're concerned about your cooler being
jostled in transit, these coolers are all pretty quick to remove and
reinstall if you have a flat-bladed screwdriver handy.

Review URL:
http://www.overclockers.com.au/article.php?id=392627