Whackypedia has you not far off the transistor count...
The initial model in the series to be released will use the GT300 chip, a very large chip that is heavily modified of G92 GPU(Up to nine billion transistors in quad core version) manufactured by TSMC in a 55-nanometer process. Versions will be available with 1.5GB, 3GB or 6GB of memory, attached to six separate 64-bit GDDR4 memory controllers on the chip.
Also the GTX295 only had lowered clocks & 448bit Memory Bus instead of 512bit. It has the full 240 shaders on each chip.
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