Hey everyone. I'm new here. Quick question. My Dell XPS 420 came with 3 gb of memory. I have upgraded the power supply to a 650 watt unit and am upgrading the graphics card to a Geforce GTX660 tomorrow. My question is, do I need to bump the memory to 4? I don't believe I can go above that as I have a 32 bit OS of windows 8. Preciate the help.