If I may, whilst I only have the free version of resolve, I use it on 2 systems, a Mac air M1 and pc with a 3070ti.
In the same settings for a 4k render, the Mac is 3 times faster, the 3070ti yields 30isj FPS and the Mac 90ish, this is all in the free version using h.265.
You may want to look at a Mac mini instead which I've seen for £599.
Have you set the options to make sure you're using your GTX card?
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Your M1 chip should be about the same speed as your 3070Ti, so if you're seeing it 3 times faster then something isn't configured right on your PC
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