am2 ddr2 dividers

[jpennstar]

Basically

(HTT X CPUmulti) / RAM Divider = RAM mhz & 2X equal effective mhz

Why does the chart have specific HTT numbers, are those the only ones the DDR2 will work with or are they just random steppings to show the progressions?

For example. Could I use 310HTT which gives me 801. effective. ???