Kingston has been building and selling enthusiast RAM for computers for a long time. The company has a line of RAM that is popular with gamers and overclockers in the HyperX series.
The new HyperX H2O series RAM is notable because rather than having the traditional aluminum heat sink the RAM has a heat sink that has barbs for liquid cooling. The heat sink allows water to be circulated through the heat sink for better cooling.
The H2O version RAM kits will come in a 4GB kit running at 2000MHz with 9-11-9-27 latencies for $157. A 4GB kit running 2133MHz with the same latencies is $205. A 6GB kit at 2000MHz with 9-10-9-27 latencies is $235.