The dual ddr memory is a motherboard option. The board is wired differently and that allows you to double the speed of your installed memory. You want to make sure that your two sticks of memory are the same size and speed. The key here, is that they are both the same and by the same manufacturer. I could be wrong on this last requirement. I don't get into these particulars that much because unmatching memory can be a real waste of time if you are a repair tech. So I avoid it like the plague.
It could be ok if you match the speed and amount and disreagard the vendor, I don't think that you have much to loose by trying it


