those are two totally different types of ram from what you wrote. and you can get like 512 of ddr (double data) as opposed to sd (single) for around 20 bucks on many sites now a days. if it is set up for ddr it might just ignore any sd stick that you put on there anyway. so you could potentially not see any performance improvement with that sd added to it. just go to newegg.com and see what they have on sale dude.