The Geforce GTX 480M and the new Nvidia Geforce GTX 485M cannot have much in common, because a performance gain of plus 42% on average in games would not be possible if they did. It gets apparent that a fully-fledged GT104 core can clearly cope better with mobile gaming demands than the trimmed down GT100 in the GTX 480M. The old ATI Mobility Radeon HD 5870 is even outdone by 69% on average.
Other than the GeForce GTX 480M, the 485M is no longer based on a trimmed down GF100 chip, but on the related GF104, which is designed for the consumer sector and has 385 cores if completely used. E.g., it is already used in the GeForce GTX 470M (but only with 288 cores) which convinced with a performance on par with the GTX 480M and low energy demand.
The technology differs quite a bit from the GF100 chip (which was actually designed for professional use) and was optimized. The GF104 has more shaders (3x16 vs. 2x16), texture units (8 vs. 4) and SFUs (Special-Funciton-Units) per Streaming-Multiprocessors (SM). Nvidia now uses the superscalar architecture, because there are still only two warp schedulers supporting three shader blocks. In theory this helps utilizing the shaders more efficiently and increases the performance per core. However, the performance can even drop below the GF100 architecture (and its predecessors) in the worst case. The ECC memory protection, important in professional applications, was completely omitted and the FP64 was trimmed down (only 1/3 of the shaders are FP64-capable, only 1/12 of the FP32 performance). Because of the reductions in comparison with the GF100, the size of a SM increased only by 25% despite the higher number of shaders. It is not possible to directly compare the number of cores to the AMD Radeon graphics cards (e.g. HD 5870) and its predecessors (e.g., G92b), because shader architecture and clock rates are different.
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