Low cost x86_64 solutions beat the pants off ARM in the PPPITA (performance per pain in the arse) department. The Raspberry Pi software ecosystem advantage nopes the moment x86 shows up to the party. Granted, it does suck the fun out of spending a weekend trying to get an application to compile.
Whether it's Raspberry Pi, Orange Pi, Banana Pi, or anything similar, by the time you buy the SBC and accessories, you're looking at around $100. The N100 or N150 are obvious choices if you're looking for a small, low power block of silicon to get something done.
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