Steffche at the moment I don’t think there is any noticeable speed improvements by running the 64bit XP, to a normal XP. to use the full potential of your 64 bit Intel or AMD CPU not only do you need the operating system 64 bit compatible but the programs running on your computer also need to be written for the 64 bit chip. It’s only when you are running a Linux OS that you will notice any advantage and increase in speed by using a 64 bit CPU.