GTX500 is a refresh of GTX400. Not much is changed at all. 10% higher clocks and GTX480 also had a shader cluster laser cut the same as GTX460 so they might have fixed that, though it doesn't seem likely otherwise it should be a helluva lot faster than testing is showing. In testing it is showing only a 4-10% improvement over GTX480 but if all the clocks are boosted 10%, that should account for the difference by itself. A 10% clock boost plus an additional shader cluster should be 20-25% faster, so something is still wrong with the Fermi picture. The extra shader cluster is either still locked or they found some way to unlock it but hobble them all so they aren't doing as much work as before. It's still mostly same GF100 core with a few efficiencies stolen from GF104 to reduce power and heat, that's all. Move along, nothing to see here.