NVIDIA's next-gen family 28nm GPUs, code name 'Kepler', are expected to come a little later than AMD's 'Southern Islands', however some numbers have been compiled to whet your appetite. The GK104 appears to be targeting AMD's 'Tahiti', with a 384bit wide GDDR5 memory bus over PCI-E 3.0 interface, however the GK 104 is not set to be the flagship part. The GK100 will be the GPU to reign over the Kepler family and will show that NVIDIA mean business.
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