Where it says GPU is capable of 1Gpixel/s, 1.5Gtexel/s or 24GFLOPs with texture filtering and DMA infrastructure you'll have to excuse my ignorance here, FPGA stuff is like an alien world to me, but isn't 24GFLOPs a rather large number..... can anyone compare this to say a 6970? GFLOPs for GFLOPs
AMD's GFLOPs # for 6970 is 683, or >28x greater.
So the 6970 gets 397 MH/s with 683 GFLOPS, or 1.72 GFLOPS / MH/s
So the raspberry pi GPU gets 24 / 1.72 = little under 14 MH/s
14 MH/s for $25 (A type is cheaper but with the same GPU) is $0.56 / MH/s
Conclusion, the normal GPUs for a normal pc are 3 to 6 times more efficient.
Another point, (most? all?) GPU miners are probably written with the opencl library, I don't know if there exists a version of it for the raspberry pi.