Changing the standard to DDR3 in the long run is probably better for AMD than using DDR2 since Intel has made the switch exclusively to DDR3. i5 will be dual channel DDR3. The current move to DDR3 is much like when AMD started supporting DDR2. Performance wise it didn't improve anything but with Intel dominating the overall market and supporting exclusively DDR2, it was a move that made more sense overall. DDR1 would have been more expensive than DDR2 with the memory makers having to make 2 different standards or ram. With AMD needing systems sold with their chips to be sold at a very low price point, switching to the newer ram standard was a smart move. I would not bother upgrading to DDR3 if you already have a very capable DDR2 based AM2+ system that supports AM3 CPU's. Since you already have a Ph II 940, upgrading to a 955 and ddr3 would not be worth the cost. I hope all of that made sense. I am a bit tired right now.