From what I observed comparing the unibody MacBook to the white polycarbonate one, the video chipset RAM issue stood out. The Intel GMA X3100 may have claimed to use 144MB VRAM because it had a dedicated 64MB VRAM and used the remaining from the physical memory. The new unibody version claims to use upto 256MB shared VRAm for the GeForce 9400. How much of it is shared, and is there even a portion of the chipset that has some dedicated memory (maybe it has 128 MB ans shares the other half)? This has aroused some thought about this when benchmarks were released comparing video performance.