No.
Absolute Minumum Requirements (Myth III, RTCW):
You really need at least 500 Mhz G3, 32 MB Vid Card and 300+ MB RAM or a 400 Mhz G4 with at least a 16 MB Rage Pro and 256 MB RAM.
No Powerbook G3's. Only the current Powerbook 667/500Mhz G4 with a 16 MB Radeon Mobility card will work. The lowest PowerMacs are the B&W and maybe the Beige G3. This is only with a vid card upgrade though.
These are the minimun requirements to play the game semi comfortably. Anything below this will have slow frame rates, choppy game play and in the heat of battle your machine will crack.
