Nupe, it doesn't support it. I asked Intel once, and they said DMVT Is the way to go. I've said that when I had their 845G chipset, if it didn't then I don't see why they would now unfortunately
... seeing how it works, it's probably hard coded on the chipset.
The only way it could change is depending on how much RAM you have on your system. For the GMA900, the max is 128MB that's dynamically allocated.
If you have 256MB of System RAM, the gfx has 128MB to play with.
If you have >128MB or <256MB, then you have 32MB to play with.