The GTX Titan Black isn't for gamers or even hard-core enthusiasts but is targeted for GPGPU developers in need of heavy dual-precision horsepower and are looking for something beefier than the original GTX Titan now that there's been the faster GTX 780 Ti.
The NVIDIA GeForce GTX Titan Black is still based upon the Kepler GK110 GPU core but now ups the CUDA core count from 2668 to 2880 (in line with the GTX 780 Ti's GK110), still has 6GB of GDDR5 video memory over 3GB on the GTX 780 Ti, runs at a base clock of 889MHz with a Boost Clock of 980MHz, and the memory is running at 7000MHz. The GTX Titan Black is only a minor revision for developers in need of the most NVIDIA dual-precision GPU power possible for CUDA/OpenCL. The GTX Titan Black will set you back $1000 USD.
For those curious about the GK110 Linux performance, there are GTX 780 Ti and GTX Titan (non-Black) benchmarks as part of the 21 graphics cards tested in today's GTX 750 Ti review. Additionally, on Phoronix is my GTX Titan: Windows 8.1 vs. Ubuntu 13.10 performance comparison, the older GTX 780 Ti Linux review, and many other graphics card reviews and display driver articles all under Linux.
Now back to running more NVIDIA Maxwell graphics benchmarks... Any other test requests can be sent via Facebook, Twitter, and Google+.