G92 is 8800GT 512mb

[RAW-Raptor22]

1.600MHz core clock
2.900Mhz memory clock (1.8GHz effective)
3.112 stream processors
4.1.5GHz shader clock
5.256-bit memory interface

With my GPU memory overclocked I achieve a memory bandwidth of 81.3GB/s.... I doubt a 256bit bus could meet that.....