Apple Hardware Test- oddity

Tonight I ran the Apple Hardware Test on my new iMac. System profiler correctly shows 256mb of video ram.... AHT shows only 128mb.
I'm not concerned, but just curious if this happens on all upgraded vram 20 inchers...
iMac Intel Core Duo 20"   Mac OS X (10.4)   2gb Ram, 256mb Vram

Just spoke with applecare and was told that engineering is still investigating this problem - the VRAM discrepency between apple hardware test and system profiler. The applecare rep did say that the system does have 256MB but could not yet confirm the problem was with AHT.
imac   Mac OS X (10.4.4)  

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