A Plex Pass is required to use hardware accelerated streaming. Without a Plex Pass the rest of the discussion is moot.
With an Intel CPU with QuickSync, you can always add a graphics card later.
If you do use hardware accelerated streaming, then you don’t necessarily need an i9 level CPU, since Quick Sync will be transcoding the video.
See this post:
Regarding performance of Nvidia GPU, see nVidia Hardware Transcoding Calculator for Plex Estimates,
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