Originally posted by: pinecone
I'm still not sure exactly what Turbocache feature is
Basically if the game you're playing requires more memory for holding textures than your video card has, it "borrows" from system memory. However, when you aren't in a game, the extra TurboCache memory is available for Windows to use, while any memory allocated in BIOS is still unavailable.
If you're not using it for gaming, then set the onboard graphics to use as little RAM as possible, as nothing else needs that much video memory.