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Hardcore gamers are not a big enough market segment to sustain x86. If everyone else switches to ARM/RISC-V, games will too, eventually.

Hardcore gamers were the reason behind a whole new chip type being introduced - the GPU. This was also when this market was a lot smaller. I don’t see this changing. The market will continue rewarding chips that cater to it. It is absolutely big enough to sustain several different completely bespoke chip types, regardless of what non-gamers are doing.

x86 will lose to ARM/RISC in gaming only if those chips provide a better gaming experience.

Also when the CPU is just an I/O peripheral for the NPU/TPU it doesn't matter so much what the architecture is.

Yeah things like heat and energy use don't matter much for gamers. Most of that comes from the GPU anyway.