I have an idea: split flightgear windows to 24 users that can use one computer with 24 cores and quad Radeon 6990 graphicscard with 6 outputs for each card.
It means that one user will use one AMD Opteron CPU of 12 cores, and 1/3 of one Radeon HD 6990 core.
Why not try it?; it will save a lot money for users that do not need to own a computer, but direct from computer server to TV-screen with 2-8 USB port for each user.