Just as Intel started supporting PC2700 DDR 333 OCZ Technology release a stick of RAM that can run at PC3500 DDR 434. The question you may have is why would you need a stick of RAM that can run so fast? There are two answers to this question.
First is performance. The faster the RAM runs, the higher its memory bandwidth and this in turn translates to faster running applications and games. The second reason is for overclocking. Most overclock application requires the increasing of the front side bus speed on the motherboard. Increasing the front side bus speed also increases the speed of the memory. If the memory used for the overclocked system can not handle this new front side bus speed, the overclock will fail. An example should help to explain it better...
Review Link : The Tech Zone