We hear about them all the time, but do we really understand how they actually work? Liquid cooled PCs – the fully skinny.

Whether you’re using a desktop or laptop computer, there’s a good chance that if you stop what you’re doing and listen carefully, you’ll hear the whirring of a small fan. If your computer has a high-end video card and lots of processing power, you might even hear more than one.
In most computers, fans do a pretty good job of keeping electronic components cool. But for people who want to use high-end hardware or coax their PCs into running faster, a fan might not have enough power for the job. If a computer generates too much heat, liquid cooling, also known as water cooling, can be a better solution. It might seem a little counterintuitive to put liquids near delicate electronic equipment, but cooling with water is far more efficient than cooling with air…. Source: HowStuffWorks