Can someone give me a bit of advise on Latency Timings?

I have 2GB OCZ XTC Gold Series DDR2 In Dual channel mode
PC2-6400 - 800MHz Timings set at: 4-4-4-13

Is this the best setup for my system, I know I have the old P4 but I will be upgrading soon. So I could use this for future reference.

Thanks in advance.........