I have a Geforce 6800 Ultra with 256MB(AGP) with Nvidia's Vista x86 drivers. I ran dxdiag and it reports the memory at 775MB and "Display Settings>Advanced" reports the correct amount.
Asus P4P800-E Deluxe P4 3.2GHz 1024MB DDR 6800 Ultra(AGP) 2x36GB Raptor RAID-0 2x250GB WD RAID-0 400GB WD Audigy 2 ZS Plat

dxdiag memory reporting
Windows Vista
User login
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