How to "underclock" ram on NF7-S

[Fern]

I set my father up with a Barton, NF7-S and pc 3200. At this point I'd prefer to wait on the planned OC (up FSB to 200). So the cpu is running at 333 (stock) and I see the ram (bootup screen) is 400. I understand he'll get better performance if it's running in sync. On this mobo how to back the ram down to 333/166? If I set the divider to 1:1 will that do it?
Thanks

 

[Megatomic]

If the CPU FSB is 333MHz (166MHz DDR) then yes, a 1:1 ratio will drop the RAM back to DDR333.