I am currently running 2 GB of DDR (not DDR2) in a dual channel arrangement on a 939 motherboard, and I am thinking of adding another pair of Corsair XMS sticks (XMS 2048-3200), but they seem to be a little scarce of late. Is DDR memory still being manufactured, and does anyone have any guesses about DDR (not DDR2) prices six months from now? Also, can anyone tell me if I will suffer any timing penalties by upgrading an Asus A8N-SLI Premium motherboard from 2GB to 4GB of memory?