Yea but dropping your CPU multiplier will mean you will have to increase your clock speed to get the same CPU speed just for the sake of increasing your RAM speed. It just seems a bit AAT to me.
259Mhz clock @ X12 multi to get back to where you are now. Fine with DDR2-1067 But you can achieve this will high CPU multi and lower clock. And remember your RAM divider too.
Whats the stock speed of your RAM?
Just read else where that reduced CPU multi's and high clocks is easier on the system.