I have a dell dimension 3000 that i got in september. It has two memory slots and no agp/pci express slots. If i got a new motherboard would that be the only thing I have to replace? Can I even replace a motherboard on a Dell? I read somewhere that you cant (It has some kind of dell-only connector or something like that). If I can, can anyone make a recommendation? I want this one to be a good one and last for a while.