ATI Technologies Nexus GA User Manual page 24

Using the 3D Memory Monitor
When you open 3D graphics on your Mac OS computer, run the
3D Memory Monitor to see how your Nexus GA has allocated
3D memory.
To open the 3D Memory Monitor
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The 3D Memory Monitor shows you how the memory on your
Nexus GA has been allocated between display, textures, and
buffers. If you use all the available memory on the Nexus GA
card, your Mac OS computer drops 3D textures and substitutes
Gouraud shading.
Page 20
Select Control Panels from the Apple Menu.
Select ATI Displays.
Click on the 3D Memory icon.
When you open a 3D application window, you can see how
the additional memory required for 3D graphics is
allocated.