Core Image requires any GPU capable of the pixel and vertex shader 2.0 standard. All Radeon Mobility 9600 chips, Radeon 9500 chips, GeForce Go FX 5200, GeForce FX 5200 and up are capable of Core Image. Keep in mind that Apple's list also said something to the effect of "support includes the following," so just because they don't specifically list a chip doesn't mean it isn't supported. Although, I definitely wouldn't recommend the FX 5200 if anyone is thinking of putting it in an old PowerMac G4. The FX series of graphics cards have pretty nasty pixel shader 2.0 performance.