I have a not (yet) working dell optiplex and I was thinking, can I get rid of the prebuilt case? It's too tight to work in to, and a tight power supply (235 watt) that I can't make big changes. I dont want to get rid of the motherboard (im broke) since theres also a pcie slot (3), so I can put a graphics card that's decent, and because the CPU is very uhh old (core 2 duo e8500) and it would put alot of cpu usage if there's no graphics card in it. (If there is any, i cant find anything) Can I buy a BTX format case and just put the mobo in?