Not that this should really surprise anyone, but I repeated some of the benchmarking that I did last year on my Intel Atom 330 board with the AMD Zacate board that I got last night. I haven't done comprehensive benchmarking yet; I just picked some 'representative' games.
The AMD Zacate board is anywhere from ~25% faster (on heavily multithreaded polygon-based games) to ~70% faster (on single threaded games) than the Intel Atom board.
So I think that for a small form factor, low power, fanless MAME cabinet build, the AMD Zacate platform deserves consideration. Just don't expect to be able to play *every* game because there are still a few dozen games that can't be run at full frame rate on the Zacate.
BTW the Zacate board I benchmarked is an ASUS E35M1-M PRO.
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