this might be more definitive. Motion uses Core Image, and only the GPUs listed below support its pixel-level programming.
Supported graphics cards:
-ATI Radeon 9800 XT
-ATI Radeon 9800 Pro
-ATI Radeon 9700 Pro
-ATI Radeon 9600 XT
-ATI Radeon 9600 Pro
-ATI Mobility Radeon 9700
-ATI Mobility Radeon 9600
-NVIDIA GeForce 6800 Ultra
-NVIDIA GeForceFX Go 5200
-NVIDIA GeForceFX 5200 Ultra
taken from
http://www.apple.com/macosx/tiger/core.html
and here's one from Motion's site:
One of the following graphics cards:
— ATI Radeon 9800 XT (R360)
— ATI Radeon 9800 Pro (R350)
— ATI Radeon 9700 Pro (R300)
— ATI Radeon 9600 XT (RV360)
— ATI Radeon 9600 Pro (RV350)
— ATI Mobility Radeon 9700 (RV M11)
— ATI Mobility Radeon 9600 (RV M100
— nVidia GeForce Go5200 (NV34M)
— nVidia GeForce FX 5200 Ultra (NV34)
taken from
http://www.apple.com/motion/specs.html