Overclocking memory

[NotAGolf]

I've just overclocked my cpu and wondered whether it is worth overclocking my ram as well. Ram is: Geil 2GB PC6400 DDR2.

Screenshot of current settings:

Couple of questions:
1. Does overclocking the memory actually have much effect outside of benchmarks?
2. If so what is the best way to overclock it, i.e. what things should I change? (timings, FSB etc)

Thanks for any advice.