The new MacBook Pro (late 2008) has two video graphics cards: NVIDIA 9400M and 9600M GT. The 9400 includes an integrated graphics processor which uses 256MB of the system RAM, whereas the 9600 provides a desktop-class discrete graphics processor with its own dedicated 256MB of VRAM. The system uses the 9400 by default, which is less powerful than the 9600 but consumes less power.
As my MBP is connected to the AC adapter most of the time, I configured the system to use the 9600 because I wanted to release the 256MB of system RAM used by the 9400. The problem is that those 256MB of system RAM are locked even though the 9600 is selected. In other words, the new MBP effectively has 256MB less system RAM than expected when using 9600M GT graphics card.
I hope Apple will release a firmware update that solves this problem.
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