GPU choice, honestly, is easy as hell right now.
If you have (or will soon have) kernel 6.2 or higher, get an Intel Arc A380.
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150€
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great h.264 & h.265 performance, VMAF scored above 3090 in most cases, especially at lower bitrates. Tests were done at release and drivers have only improved
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literally the cheapest AV1 encoder GPU available
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open source drivers
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less that 100W full load
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small form factor