Are the new AM2 boards and processors better?

I saw that they include ddr2 memory, but I also heard that they don't make much difference. The popular standard seems to be pc3200 aka ddr400. I have a athlon 64 x2 4800 and I would like to change it if the performance is going to be better. They have a athlon 64 x2 5000and I assume it will be better than the one I have. I have a friend who will be mine, so its not like I want to just join the hype and all. Video editing ang gaming are my major concerns. Anyone's opinion is greatly appreciated.