Re-engineering computer hardware is an expensive and time-consuming process. That’s why the technology usually evolves gradually, rather than in fits and starts; great leaps are risky. When you do something novel, it needs to be for a good reason. When Antec recently introduced two new types of coolers, the Kuhler 1250 and the 950, it did something pretty different. In a closed-loop liquid-cooling (CLC) system, the pump is customarily integrated into the heatsink that sits on top of the CPU.