The Intel CPU of the GPD is green, so is it better than the OMAP5432? Why is that, more cores? What will it do better?
1/ Integration:
TI OMAP5 in Pyra is 28 nm.
Intel Atom x5 Z8500 in GDP is 14 nm.
So that Atom x5 has four times more integration (you have to compare square or those numbers because it is a suface with 2 dimensions).
Atom x5-Z8500 is a processor released recently, in 2015, while OMAP5 is available since 2013.
2/ OMAP5 has
two 32 bits Cortex-A15 [1] cores at 1,5-1,7GHz.
Atom x5-Z8500 has
four 64 bits x86 cores at 1.44 GHz (2.24 GHz burst frequency).
And I suppose Intel has a much bigger cache (Intel is very good at cache size and performance). It has 2 MB L2 cache.
I don't know how much energy they will need at full speed, but doing exactly the same work (same OS, etc), Intel x5 would waste less energy (4 times more integration, so it compensate x86 bad design).
The good part is that Pyra as upgradable CPU board, so in a future time we can see a much better CPU/GPU/RAM on it, while GDP will be forgotten.
[1]: OMAP5 has 2 Cortex-M4, a very small cores, but I suppose they will be useless with Pyra Linux distribution (they use a small ISA, so they can't run the same code Cortex-A15 can run).