Will AM3 processor support DDR RAM ?
No it will not. read the motherboard standard for accepted memory. Your a-gonna have to upgrade the Ram. if you go into the details of the CPU listing, you can see the type and speeds that are compatible with the CPU/Mem controller.
this AM3 Cpu supports from DDR3 1337--DDR2 1066 for example.
You wont find one that will work with first gen DDR however.
So that means i have no use from DDR RAM memory, cuz i have 3x 1gb DDR ram cards ....
if there is no way to use them on AM3 only thing i can do with them is sell them adn even that will be hard to do, right ?
You can ebay it and see if there are any takers. Have young kids? DDR would work as a nice ABC's first machine.
Other than that, yeah, they are pretty much paperweights. any legacy demand is for DDR2.
The good news is that DDR3 is very inexpensive (probably as cheap as you will see it) from hear until DDR4 is released.