Reverse TurboCache?

[Sovereign]

TurboCache is a driver technology that enables lower-end nVidia cards to access the main memory of a PCI-E based system as if it were local memory to the card (so nV's marketing department says, but you get the idea. Shared memory. Boo.)

However, can you reverse the process and allow applications to use the GDDR3 on a high-end videocard instead of going into the slower system RAM? I was using 3ds max today, and it was eating about 510MB of RAM and on top of that 510MB for virtual memory as well. I just thought "If 3ds max could use my second 7900GTX as RAM (with SLI off of course), then this wouldn't happen and everything wouldn't lag so bad..."

Thoughts? Is it ingenious or idiocy?

[DMB2000uk]

Does vista use this turbo cache, as my limited usage of that is reporting my 256MB card as a 512MB one.

Would the PCIe bus be able to handle the massive bandwidth provided by the gddr3 and wouldnt the latency be too high?

Dan