RAM Timings and OC Question

[Yurka]

Ok, Got Asus P5KC mobo + E6850 CPU + Crucial Ballistix 2GB (2x1GB) DDR2 PC2-6400C4 800MHz

I've set the timings to 4-4-4-12 and ram voltage to 2.2 as specified.

Now CPU-Z says the Ratio FSB:RAM is 5:6, could someone explain fully how this is calculated please. Though If i do overclock it, will have to put the ram timings back?

 

[Yurka]

ah so to calculate the divider, you take the number of the difference between the FSB and ram frequency - in this case 66mhz, then divide that number into your fsb and ram frequency to get your divider?