Here's how my 8600GTS shows in System Profiler:

Graphics by NVIDIA:

Chipset Model: Graphics by NVIDIA
Type: Display
Bus: PCIe
PCIe Lane Width: x16
VRAM (Total): 768 MB
Vendor: NVIDIA (0x10de)
Device ID: 0x0400
Revision ID: 0x00a1
ROM Revision: NVinject 0.2.0
Displays:
Display Connector:
Status: No display connected
MP620p:
Resolution: 1024 x 768 @ 60 Hz
Depth: 32-bit Color
Core Image: Hardware Accelerated
Main Display: Yes
Mirror: Off
Online: Yes
Quartz Extreme: Supported
Rotation: Supported

You'll notice that the VRAM size is listed as 768MB.

My card actually only has 256MB... It the Installer, I didn't just choose NVInject 256. I also selected 512 and 768. I'm not 100% sure but I think it helped my video card work with full support "out of the box"... (the new nvidia's like to use system or "virtual" memory and report more available memory than they have physically on the card - I noticed that in Windows also...) Can't hurt to try...

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Running both 10.5.8 and 10.6.4 on my stinking AMD/ATi machine...