While there were performance improvements under select OpenGL workloads, with the OpenCL performance for the tested driver releases, there were not any notable changes with the GeForce GTX 680.
The NVIDIA GeForce 600 series "Kepler" driver performance under Linux has been quite stable in terms of stability and performance with the only improvements in the tested driver releases to point out being for Unigine Heaven and Xonotic. Overall, the binary NVIDIA Linux graphics driver is in great shape for this latest-generation hardware (though overclocking support under Linux is still missing for Kepler and Fermi), but it is too bad that there still is not any good open-source support. The Nouveau driver for Kepler can work, but there is external microcode needed and there is no re-clocking support at the moment.
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