Will be upgrading my P4 in the coming months. I have read a lot about using 64 bit OS but never heard anyone hear talk about their 64bit hardware. My question essentially is : In order to run a 64 bit OS in Windows, is the motherboard and memory the only things that I have to consider hardware wise? Believe it or not I have been using an off the shelf Dell P4 2.4 with 2gb of Ram for the last 6 years. Any reason not to go Dell again?