http://www.kingston.com/hyperx/products/h20.asp

Yeah, its 4GB and 6GB kits, not sticks.

"The water-cooled DDR3 memory includes 4GB sticks running at 2133 MHz and 6GB sticks running at 2000 MHz."

Wait, are you sure its not 4GB and 6GB kits (dual channel and triple channel)? Seeing larger ram sticks in general population would be good, don't get me wrong, but gamers seem obsessed with small amounts of faster ram, when windows seven seems to do better over time with large amounts of somewhat slower ram.

...I really don't see the need to watercool DDR3 as it runs at a lower voltage. Only when you get close to 2 volts does it need some extra cooling.

DDR3 hardly gets warm compared to DDR2.
Even the big heatsinks on some modules are overkill.