NZXT Technologies Kraken X61 280mm All-in-One Liquid Cooling System
In terms of raw cooling power, this is a very impressive unit that can work in a wide range of systems. It has a 280mm cooler that offers some of the best possible cooling in a liquid-based CPU cooler. This is one of its biggest strengths, but can also be a drawback. This large size is great for some machines, but is impractical for smaller computer cases and towers. You get a software controller with this cooler and it has a variable speed pump, which keeps it running quietly while still removing heat from your CPU. It comes with two 140mm fans, which spin at between 2400 and 3600 RPM to produce up to 106 CFM of airflow. This cooler also fits a wide range of CPU sockets, for both Intel and AMD processors. At low speeds, this cooler only produces about 29 dBA of sound, which is very quiet. The six-year warranty is just the icing on the cake, offering more protection than pretty much any other manufacturer.