Well you can't factor in the mobo and ram because you need that for GPU mining anyway although you can divide it with the GPUs you put on that mobo. However you can mine with your CPU and GPU at the same time with that same mobo as well.

According to djm34's initial tests the CPU/GPU ratio based on hashrate is not that far but that remains to be seen once optimized miners are developed. Currently it's about 1:3 (assuming an 8 core CPU) so if you look on a cost standpoint it might be similar which would be ideal but remains to be seen. Gotta step into the unknown!


There's another CPUminer https://github.com/JayDDee/cpuminer-opt

This has lyra2z support!