I'm looking to build a new computer this summer (Summer 2005) and have started looking around and pricing out componenets. One thing that caught my attention was dual Xeons. I like the 64-bit support and now they have 800 Mhz FSB's like the P4C's. I do a lot of development with Visual Studio, MSDE/SQL Server Express, run virtual machines (VMware), and I occasionally play some games. I'm building this computer in anticipation of Windows XP Professional x64 and Longhorn. Is the extra cost of dual 64-bit processors worth it and will there be a big difference in performance?