So I have a old hp pc that we don’t use and I want to buy a gaming pc but I don’t have the money for it. I already did upgrades to it like moving from a he’d to an ssd, installed a house, put a phenom ii x4 945 in it. I installed a WiFi card because I wanted to move it up to my room but the router has to stay downstairs. The ram is 4gb of ddr2 but only 3.7 is useable. Please tell me what upgrade I can do to the ram.