What hardware should I upgrade to support 4K 10-bit HDR HEVC?

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I'm not one to dissuade somebody from upgrading their hardware, but if all you're looking for is the ability to play back HEVC HDR content, your hardware needs to decode 10-bit HEVC. Jellyfin will figure out what to encode to based on the client's requested format. In general, I see transcoded content go back out in H264, which any dGPU or iGPU worth talking about in HWA conversations will handle.