I have a Lasagna Cooler from Tennmax on my GeForce. It seems to work pretty well so long as you have proper ventilation around it. It "picks up" heat off the chip really well, as far as I can tell by touching the thing. However it's kinda pricey (~$20). But it saves space and it works really well, not to mention looks cool. I've seen people mount socket coolers to graphics chips but I'm not sure how to securely do this.