Yeop that will be fine on the desk, you could look on the manufacturers website to find the maximum load data or contact them directly.
Water cooled pcs have deionised water running between heatsinks on the hot parts which are normally cooled by air. Normally just the graphics card and processor are in the loop but you can add it to virtually every component if you wished. water is more effective at disspating heat then air and you can have more fans on a radiator from a water cooling loop then if you were trying to cool the component directly. You can overclock components above their industry set standards and thus get a faster pc for little expense, this rarely is possible with stock pcs like dells as they remove the settings from the bios menus but with home built pcs it is very common to overclock. My processor is rated at 2.66ghz and I have it overclocked to 3.7ghz on just well planned and high end air cooling. I was going to do watercooling on my pc but never got around to it and now I will be oving away and unable to take my precious computers with me. Lots of cooling methods exist for pc's from air to airconditioning to thermoconductive liquid (similar to how a freezer or fridge cools down and the ultimate overslocks are achieved with liquid nitrogen.
What rig have you got infidel?
My main desktop is:
Q9450 @ 3.7ghz
Asus striker 2 formula
2x2gb G-skill pi blacks @ 1011mhz
500gb 7200.12 seagate, 320gb 7200.11 seagate and 2x500gb 7200.10 in raid0
GTX260 55nm XFX black edition main card
8800gts 640mb physx card
Thermalright ultra 120 extreme
BFG ES-800w
All tightly wrapped in a lian li A71A
