Hardware for 4-5 4K and home lab

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I have a UHD 730 and I am barely getting one 4K HDR > 1080 SDR stream. Tone mapping seems to be very taxing. I'm not sure the UHD 770 is 5 times more performant than the 730.

The UHD 730 has a single MFX core is my understanding, while the 770 has two. I really don't know the best way to test performance on this front honestly. Probably not the right topic for that discussion. And we're just proving OP's point that all the options and lack of data out there are confusing and problematic.