DDR AND DDR2. Believe you'll find those that do work with either DDR and DDR2 don't work with both (RAM types) at the same time. It's one or the other.
I have a Gigabyte GA 7N700 Pro 2 mobo and a Socket A AMD Athlon XP/Duron 2600 Processor and two sticks of 512MB 3200 DDR RAM
Would an added two sticks of 512MB PC5300 DDR2 RAM work in the above setup?