Your board has a 16X PCIe slot, I believe. So you can install just about any modern PCIe card you want. Next question is, what type of PSU do you have, and what is your budget, and what kind of performance you are looking for? As the rest of the system is getting pretty dated as well, but you will get a huge boost from doing the following. To match the rest of your system, I would be looking at something like a 4630, 4650 at the most.