Have people seen the Parallella architecture from Adapteva, currently kickstarting at http://www.kickstarter.com/projects/...r-for-everyone

They have an scalable multicore architecture, and are aiming to make 16 and 64 core chips, with very low power consumption (~2W for 16 core), and reasonable CPU power. There long term goal is 1024 and 4096 core models. Its not a SIMD architecture (like a GPU, or SSE, AVX, Neon on a CPU), so it can achieve a higher computational efficiency. The patches are in GCC since 4.7, and the dev boards run ubuntu on the host dual core ARM A9

There are spec sheets and manuals
http://www.kickstarter.com/projects/...bouTheEpipProc
and some demos
http://www.kickstarter.com/projects/...e/posts/324625

The 64core dev board might be quite competitive with a desktop for image and video processing if your app has openCL or openMP support (GEGL/GIMP, blender, etc).

The 16core version is cheaper than a pandaboard, and has a similar dualcore ARM A9 as the host (so if you were thinking of buying a pandaboard, you may as well get this, and get a free 16core coprocessor).

A 1024 core version would be like a xeon phi. it could also make a very nice opensource graphics card via LLVMpipe.