New
#11
DDR2 is expensive, but the cheapest option is to not spend any money at all, and to look at what else could be causing the slowness. Then save your money for a full upgrade. Your processor is still Socket 775, meaning the board you will now buy isn't going to be able to be reused in another upgrade down the line. You will be spending money now for no yield in performance, all for parts that can't be reused in another upgrade. See what I'm saying?
If it was me, and I was thinking of buying a new board right now...I'd wait until I could get a new processor to go with it, and go right to a P67 or Z68 board. I hate to see people spend money to tread water.