Barefeats compared performance of a MacBook Pro 2.2GHz 128MB VRAM vs. a 2.4GHz model featuring 256MB VRAM.
Test were performed using different games, and both the notebook display (at 1200x800 and 1440x900) and on an external display (1920x1200).
Results do not need much comments, as doubling the VRAM does not provide any advantages, marginal higher performance of the fastest model is directly linked to the higher clocked CPU. To benefit from 256MB of VRAM, one needs to play GPU-demanding games or use an external display.
With leopard and the integrated Core animation, and GPU-based rendering it might be another story.
[translation by Linathael]
