The video card in a Power Mac G4 cannot be upgraded; it already has the maximum allowable memory (16 megabytes) installed.

Both the AGP and PCI cards come with 16 MB of memory installed; they are not upgradable beyond that amount.

The following resolutions are supported:

640 x 480 @ 85 Hz
640 x 480 @ 75 Hz
640 x 480 @ 72 Hz
640 x 480 @ 67 Hz

640 x 870 @ 75 Hz

800 x 600 @ 85 Hz
800 x 600 @ 75 Hz
800 x 600 @ 72 Hz
800 x 600 @ 60 Hz
800 x 600 @ 56 Hz

832 x 624 @ 75 Hz

1024 x 768 @ 85 Hz
1024 x 768 @ 75 Hz
1024 x 768 @ 70 Hz
1024 x 768 @ 60 Hz

1152 x 870 @ 75 Hz

1280 x 960 @ 75 Hz

1280 x 1024 @ 85 Hz
1280 x 1024 @ 75 Hz
1280 x 1024 @ 60 Hz

1600 x 1200 @ 85 Hz
1600 x 1200 @ 75 Hz
1600 x 1200 @ 70 Hz
1600 x 1200 @ 65 Hz
1600 x 1200 @ 60 Hz

1920 x 1080 @ 72 Hz
1920 x 1080 @ 60 Hz