The 'radiator' in a liquid cooling loop is only the heat exchanger. It requires a pump, tubing and some sort of interface block that transfers the heat watts being put out by the CPU (or video card) to transfer into the coolant - think of a water block for a component as a heatsink that interfaces with coolant rather than water.
Before you get very far, you're going to need to understand how to overclock; just using a GUI tool from within Windows isn't the best method. You're going to want to do this from within your BIOS and requires an understanding of how to adjust timings and voltages for your motherboard, RAM and CPU. It also requires that these components, and power supply, are good, stable and reliable.
If you have questions on liquid/watercooling, see the watercooling sticky link in my sig line below. I'll be perfectly honest - the link with those closed loop coolers are your common, run of the mill coolers, but you get what you pay for. In most instances, good air coolers perform about as good and in some cases, better than some closed loop coolers. Liquid/watercooling doesn't all perform like a full watercooling loop.