I have a really old dell with a pentium 4, not sure about any other specs, besides it runs windows xp. Is there a stronger CPU I can upgrade and add a gpu and more ram? I need to know the compatibility before buying of course. I don't want to buy a new computer because I just want this one to run older games like halo 1 and gta san Andres. Thanks if you have experience with older computers like this 
