Source: CinemaDNG RAW 3:1 4000x2160p24
Encoding: ProRes 4444 XQ, resulting file size 38GB
AMD 560X: 39m12s (discrete MacBook Pro GPU)
AMD WX9100: 15m46s
2.6X faster! = worth $1500
Curiously, when exporting as ProRes 4444 XQ media info is labelled correctly while using the Rec.2020 colorspace as seen below.
this cannot be said when exporting as H.265 8-bit
Of note, Handbrake does not utilize the GPU at all, so if you’d didn’t tick the CPU upgrade on your Mac during check out you’re out of luck!