Riecoin GPU miner update:

RIC mining performance is disappointing - Nvidia's GTX 780 Ti (Classified) is only 3x faster than Intel's Core i7-4770K (AVX2). But the Ti is 8x faster than the 4770K when used for XPM mining, so there is still hope. Apparently,  Nvidia's compiler still works best with small kernels. Modular multiplication for XPM and RIC uses 12 and 42 machine words respectively on the GPU device. The next step will be to write smaller kernels for the RIC core, but I will not be able to get back to this hobby for about a month from now.

It would be interesting to find out the difference in performance for a RIC core between a GTX 780 Ti and a Radeon 290x. I have reason to believe that the GTX 780 Ti's performance should far exceed that of the 290x. But without an optimized RIC core for the 290x, it will be difficult to tell by how much. Hopefully someone who has excellent OpenCL programming skills can provide to us performance figures for the 290x .

Sorry for the typos, my smart phone screen is small.

Edit: fixed a couple typos