Here is some description of one of 3D Flight Simulation's test setups. This is not a recommendation but rather a guide for those looking for a minimum hardware setup.

Motherboard: MSI K8N Neo2 Platinum (selected for it's 8X AGP Port, NVidia chipset, dual channel memory, and socket 939 AMD 64 support. Very good bang for the buck.)

Processor: AMD 64 3000+ at 1.8 GHz

Memory: 1 Gigabyte RAM

Video Card: XFX GeForce 6800GT AGP 256MB DDR3
also tested: ATI 800XT (to be reviewed at later date)

Projector: Optoma EP 745, 2300 lumen, 1024X768 (XGA)

eDimensional wireless 3D glasses

Naturalpoint TrackIR PRO with vector expansion

Saitek cyber force feedback stick

CH rudder pedals (highly recommended for it's non-linear adjustment capacity).