Memory Latency and Speed

I am overclocking my E6700 and OCZ PC2-6400 memory.

The CPU can hit 3.6GHz easily with a multiplier of 8 and an FSB of 450, allowing the memory to easily run at 900MHz (effective) with a 100MHz overclock. The problem I face is with timings; I leave them set to 'auto', the stock timings are 5-4-4-15.

Which is most effective: Bandwidth or Latency?
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