Scaling isn't exactly linear. Some games will see around a 2.13x speedup over GT200, some will see less. In cases where the new arch removes bottlenecks, there may be a few games with more then 2.13x increase. But of course we will need to see benchmarks to know how it works out in reality.
They might not hurt performance, but they do cost die space and increase power consumption. Only time will tell if these end up being useful features for most customers, or just wasted space/electricity. It really depends on how the GPGPU market evolves.While it is true a number of the HPC tailored features won't necessarily benefit game performance very much, they also will not hurt performance in any way.




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