An Apple tech told me on the phone yesterday that 1GB of VRAM was an extreme amount of VRAM and that FxCM (Final Cut Pro X, Compressor and Motion) would NOT benifit from the 2GB VRAM upgrade. He said that the extra VRAM only came into use for 3D rendering like games and the like, but it was a waste of money for FxCM.
This is inline with my understanding that this VRAM is useful only used for 3D texture maps for 3D rendering. It does not aid in rendering 2D from a NLE or help accelerate transcoding video in Compressor. I'd love it if someone could provide benchmarks to support that the 2GB upgrade directly enhances FxCM.
To me it's a no-brainer to NOT spend money on something does not do anything usefull, even if it's only $100.