am2 ddr2 dividers

[JumpingJack]

This should be stickied...seriously. When i need to find it while at work, and the computer at work refuses to take my flash drive, this would be REALLY nice to have.

It is actually simple, you do not need a table.

Memory speed will be clocked by the divider as CPU clock / divider integer.

For example, a processor running DDR2-800 has a would ideally clock the memory 400 MHz (double date rate = 800 by nomenclature), so a 2.4 Ghz AMD AM2 CPU will use a divider of 6 to get 400 Mhz to time the clock

Mem speed = CPU/mem divider

The caveat is that Mem speed <= rated memory speed (i.e. less than or equal to rated speed), otherwise use the next highest divider integer.

For example, using my DDR-800 info above.

a) 2.4 GHz CPU, 2400 Mhz / 6 = 400 MHz for DDR2 -800 -- everything is ok here.

b) 2.5 GHz CPU, 2500 Mhz/ 6 = 417 Mhz for DDR2-800 <==THIS ONE WILL NOT WORK because it would time the memory above it's rated value. Therefore, use the next highest divider, 7.... thus a 2.5 GHz AM2 CPU will time DDR2-800 not as 400 Mhz but as 2500/7 = 357 Mhz or the nomenclature equivalent of DDR2-714

Jack