Asetek prototype brings liquid cooling to all-in-one PCs
 

In theory, I like the idea of all-in-one PCs like Apple's iMac. By packing everything behind the screen, you end up with a system that has a minimal footprint and can even be mounted on the wall. The all-in-one approach also reduces the number of connections and cables for users who tend to be intimidated by such things.

All-in-one PCs are usually quite slim, making it especially difficult to cool their internals, especially if one wants to do so quietly. That's put a bit of a damper on the level of hardware available in current designs, although to be fair, Apple's latest 27-incher can be configured with a quad-core Core i7-930 and Radeon HD 4850 graphics. The smaller 21.5" iMacs are limited to dual-core CPUs and graphics options that top out at the Radeon HD 4670.
http://techreport.com/discussions.x/19202