I have a PIII processor and 512mb of SDRAM. Does DDR Ram make your system a lot faster? If so do I need anything special to use it or can I just buy some and swap it out with my current ram? If so which is better 512mb of SDRAM or 256 of DDR Ram? Not sure if I can afford 512mb of DDR ram right now. Thanks in advance for help/opinions anyone can provide.