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I'm doing VR on a 6 year old i7 and it runs perfectly fine. Improvements come almost entirely from updating the gpu

There won't be many GPU upgrades left if the manufacturing processes don't improve. GPUs are much closer to the theoretical performance you can squeeze out of a piece of silicon than CPUs.

I doubt it. My new gpu released in 2019 is 3x as powerful as my 2013 gpu but the new CPUs are mostly only improved in core counts.

Rendering is also an insanly parallelizable task. In the worst case we can always slap 2 of the same gpu on one card and get them to render half the screen or for vr, one gpu per eye.

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