It’s only relatively recently that ARM-based home computers are showing up with performance comparable to the x86 family of CPUs. For a long time ARM has been the top of the heap when it comes to offering the best tradeoff between fast computing and low power consumption, which is why it’s been the go-to chip for mobile phone and tablet makers.
But non-casual gamers have never really cared that much about low power consumption, they just want high performance (edit: and for most of pc gaming history, that’s meant fast performance on one, or only a few, cpu threads. Games which make good use of massively-parallel computing are coming but aren’t quite here yet, and that’s another area where ARM shines.) I expect that ARM will make up a bigger and bigger share of high-performance desktop computing in the years to come, and it will become more common for game developers to target ARM systems.
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