I'm a little confused by the video RAM specs on the mini. The Apple site states that the low end version (1GB RAM) has "NVIDIA GeForce 9400M graphics processor with 128MB of DDR3 SDRAM shared with main memory", while the upper version (2GB RAM) has "NVIDIA GeForce 9400M graphics processor with 256MB of DDR3 SDRAM shared with main memory". But in both cases "Minimum graphics memory usage is 128MB for 1GB configuration and 256MB for 2GB configuration". Now, if I've read this right, there is no dedicated VRAM, and the graphics processor shares main system memory. Also, in a 1GB configuration 128MB is given over to the GPU, whereas it's 256MB for the 2GB configuration. Does this mean that if I buy the 1GB version and upgrade it to 2GB or more that the GPU will get a memory boost from 128MB to 256MB? Or is there some hardwired difference between the two configurations?