Dual Channel options

Memory:

http://www.newegg.com/Product/Produc...82E16820141474

and 256mb PC3200

My motherboard:

http://www.newegg.com/Product/Produc...82E16813131014

Could I run dual channel by getting another stick of the same 512 and still use the 256mb stick?

Nope, you must get two identical sticks of RAM. This doesn't just include size, either. It must be the same model, speed, size, etc etc...

Now, I'm not 100% sure if it'd work using say two 512s and two 256s...