> Plenty of Mini-ITX stuff out there today that's very powerful. Granted it's 4 or more > times physically larger than an RPi, but we're still talking much smaller than a > regular desktop system. > You might be including this in you mini-itx category, but the Atom processor/platform does pretty well with MAME. Worth checking out if you want something, generally, full-featured in a small form factor with low power consumption.
The other thing to keep in mind is that older version of MAME tend to be a fair amount faster than the new versions. So, if you don't need to play a game that was added in the latest release, it might be worth it to use an older build (0149?).
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