While Microsoft has not officially released the system requirements for FSX, their comment above is typical of how the Flight Simulator platform is designed to run on a range of systems. But, you cannot have it all ways. Based on past advances in the Flight Simulator line, we can expect FSX to perform to our community's high standards of smooth graphics, awesome audio, breathtaking scenery, exquisite details and exciting adventures - on systems that are at today's moderately high end of the PC system spectrum. This means, don't expect FSX to give you a great flight on your trusty old Pentium III. Take a look under your hood. If your PC is at least a Pentium 4, 2.8 GHz, with at least 1GB of SDRAM and a fast EIDE or SATA hard drive, with a 128MB 8X AGP video card - you probably have enough horsepower to "run" FSX. Just as with FS2004, you'll need to dial down some of the performance settings to have a smooth flight with simplified graphics, weather and traffic settings. a 3 GHz system would be my recommendation for a basic place to start.