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Each 32-bits chip is able to operate at 5Gbps bandwidth and to process up to 20 GB/s of data. Depending on the graphic memory bus, data speed will evolve, from 160GB/s on a 256-bits bus, to 320GB/s on a 512-bits bus. With the latest memory bus, such chips will allow 2GB of VRAM to be managed on graphic cards.
If some users might think that this is a lot of memory for nothing, they should although consider that GPUs are currently used by OS X as well as Vista to boost display and rendering of both OSes. In addition, as the size of LCD panels will not keep increasing at a steady state, the future evolution in this field will be driven by higher resolution, always more pixels packed per inch, especially considering that doubling pixel density in both directions, the number of pixel to be managed is then 4 times higher.
