Does DDR work in DDR2 slots?

[Neruka]

I planned to upgrade my gfx card alone but its pci-express these days not AGP so I need a new MB aswell as my current is AGP only. My cpu is backwards compatible but will my old DDR ram work in the newer boards?.

Thanks.

 

[Neruka]

Damn, so its new mb, ram and gfx card otherwise dont bother :/.

My cpu is an amd 64 3400.