RightMark Latency
On the latency tests, the much lower latency 3-2-2-7 PC2-5400 memory wins by a large margin; with the best result being a full 13.4% faster than the PC2-6400 with 4-4-4-10 timing.
RightMark Bandwidth
For the bandwidth test, RightMark does a mixture of reading and writing, and it is also quite affected by latency - so it is not surprising that the very low latency PC2-5400 memory had the second best result; and the Crucial PC2-6400 was in third place, 12.9% behind the best score posted by the PC2-8000 memory.