Ideal RAM Timings

Ok. I am new to Tom's Forums, but anyways.

I am looking for the ideal RAM timings on my setup. Originally they are 5-5-5-18-23(tRC)

Now, I figured out easily how to set it to a faster 4-4-4-12-2T setting in the BIOS, nothing hard at all, any power-user not heavily taxed by doing so, however, my motherboard bios has much more for configuration of my RAM than just the CL, tRCD, tRP, tRAS, and CMD settings.

I am running:
Core 2 Duo E6750 @stock 2.7GHz
2GB A-Data DDR2-800
ABIT IP35-E Motherboard

If you need any further info, I can provide to the best of my abilities (I don't want to write down the other options, which I just left on auto by the way. I can if I must but I can't be arsed to restart.)

Thank you in advance for any help you can provide.