Apple Hardware Test incorrectly reports VRAM on iMac (Early 2006)

Apple Hardware Test is provided on a disc with every Mac and can be used to test hardware in a standalone environment.

The 3A100 version of Apple Hardware Test that shipped with iMac (early 2006) computers incorrectly reports the amount of VRAM (video random-access memory) installed in your computer.

The most accurate way to determine the amount of VRAM installed in your computer is to restart the computer in Mac OS X and follow these steps:

1. From the Apple menu, select About this Mac.
2. Click the More Info button, which will open System Profiler.
3. In the left-hand column, click on the line titled Graphics/Displays under the Hardware heading.
4. In the window to the right, details of your video card will appear. One of the lines says "VRAM (Total):"—the amount of Video memory appears on this line.