On modern hardware, x264 at a reasonable preset is fast enough that it rarely pays off to use NVEnc for file-file encoding; generally a RTX 2060 is going to be coupled with a number of fast, modern cores. What GPU encoding is really good for is things like capturing game footage during game play, where the CPU is already heavily taxed, and running x264 as well would hurt FPS.
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Ben Waggoner
Principal Video Specialist, Amazon Prime Video
My Compression Book
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