the reason you need to sell the ram is because, well there is a guide on i believe DFI Street on ram, and if you get 2 different types of ram it will not benefit you. and if you buy 2 seperate sticks you cant use dual channel, they have to be EXACTLY the same, not even the stepping can be different. so go with either HD or sell ur current stick and get 2GB ddr500 g.skill.