In theory, the game can run on any Pentium-class processor with a Voodoo2, but don't expect much performance over 20fps and expect loading time to be over a minute. Technically, the game can run on a 486DX machine but for minimal requirements we expect a certain level of playability to draw the line.
Pentium II 233MHz / AMD K6-2 300MHz or equally powerful processor.Installing OpenArena Windows System Requirements
