I know buying a prebuilt isn't always smart but I was getting impatient and it's not all that bad of a rig I have the gua1600bst from cyberpower and i wana upgrade to gpu to a 4gb and ram sticks but I have that handled I need help any recomandations of a 4gb that will works my mobo is the gigabyte ga-78lmt-usb3 r2 ik it's a old board but it's all got for now please help thanks fellow gamers