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It's probably a lot to do with there being so many different cards/pcb layouts, whereas with cpu's, it's just a matter of using the correct bracket for a relatively small selection of standards.
 
Also with some cards there are other parts that require cooling such as the vrm's, theese are quite a bit away from the actual core. Unlike cpu's which are all a fairly standard size. I have seen some clc solutions modded though to work on gpu's.
 
There is a few aftermarket cooling solutions and its true that only the smallest fraction of those are GPU aIO coolers. I am using a PNY liquid cooled gtx580 atm, a pre-installed Asetek AIO loop on the core with a full cover heatsink and fan over the VRMs. It is an absolutely stunning cooling solution, so much that i have a waterblock for the card but never installed it as it runs cool and quiet by itself.

There are plenty of mod guides out there showing how to attach a AIO cooler to the vast majority of GPUs, most are securely held with just cable ties! I got a reference 580 cheap not long ago and did one of these mods and got the same results as my PNY liquid cooled.

The reason why we don't really see it is because people wont try it themselves. Aftermarket cooling solutions usually start with the modder being innovative rather than than retailers. Retailers then spot the niche in the market and follow by offering their own solutions. This is how modern custom watercooling developed.

I cant really picture anyone who would be willing to pay for a CLC for their GPU and not be willing to fit it themselves. Seriously, it was easier than the vast majority of air coolers i have installed to a CPU.
 
Semaphia said:
If the VRM's can be cooled with an air cooler, surely some clever boffins can figure out a method to do it with a CLC system :)
Click to expand...

You can make a full cover heatsink that will have contact with MOFSETs, RAM and the chip, then mount the cooler directly to the heatsink over the chip using screws. This is essentially how Heatkiller's custom DIY VRM waterblock kits work.
 
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