I tried RTCW on my macmini, its a bit low on the vram side 32MB, but other then that ok.

got it running on medium/normal quality and 1280x1024 resolution.
its runs very smoothly even on a 32mb vram machine, watched some of the videos/cutscenes was great, had one problem installing.

failed at the copying of the last disk, some read error.
i just manual copied the rest in and seems to work ok.

XzIt

Pegasos 2, G4 1 Ghz, 512mb ram, 500 gig hdd, MorphOS 2.7 Registerd.
Mini Mac, G4 1.25 Ghz, 512mb ram, 40 gig hdd, MorphOS 2.7 Unregisterd
Commodore 64, 128, Amiga 500, 600, 1200, 3000, 3x4000, CD32, CDTV