DDR2 is by no means a dead technology; AMD still has a major vested interest in it as all its current AM2 and AM2+ CPUs run on it. AMD is not as fortunate to swap memory technologies as Intel, since AMD has elected to build memory controllers into the CPU. This results in a far better performing CPU, but limits them to upgradeability. Intel also continues to support DDR2; we thought the 4 series chipsets would be DDR3 only. Intel still supports DDR2 on the X48, P45, P43 and all the G4x series chipsets. Clearly DDR2 still has its place, and why? - It's cheap!!!
DDR3 is the highest costing memory to come out since RAMBUS brought out RIMMs; while they died a very quick death (thank god for that), DDR3 lingers as its clocking is by far better than anything DDR2 is able to produce. Yields will increase more over time, but until that day DDR2 is still the most used memory on mainstream PCs.
OCZ is by far one of the biggest supporters of overclockers out there; this has been evident by bringing out memory that has a water jacket built into it, allowing extreme cooling users to simply pump some H20 into it and cool it down better than that of ordinary air cooling. This is quite sensible really, considering if you have a water cooled system you don't have that many fans inside to keep things cool. RAM at high clock speeds needs some serious cooling, or you're back to blue screens and crashing to desktop situations.
Today we have the newest incarnation of the Flex memory from OCZ with their own built in water jackets. The Flex-II PC2-9200 Kit comprises OCZ's highest clocked DDR2 memory modules; how will they perform? - Let's have a bit of a gander and see.