Overclockers Online has posted a review on the SimpleTech PC2-4200 DDR2 memory

The chips scaled very well. As mentioned, I was able to take them above 350 MHz into Windows, however at an increased latency, 5-5-5-12, and increased voltage, 2.2V. Stability testing was out of the question as the processor would just throttle the FSB down as load picked up. Otherwise, 333 MHz was completely stable and at a 4-4-4-12 latency - over 25% faster than the rated speed and at nearly the same latencies. I was very impressed for what I was told is just standard, no frills memory.

Read more