I brought up HANDBRAKE in regard to "sustained performance." A big thermal load is a big thermal load.
Again, my 9700K will run a big AVX load like HANDBRAKE, all 8 cores at 4.8 GHz ALL DAY LONG and the core temperatures don't exceed 65C. The Mac Pro's "sustained performance" is nothing special.
32 core Threadripper 3970X, overclocked, can run full bore indefinitely and stay under 75C. Again, the Mac Pro's "sustained performance" is nothing special.
And that's totally fine, but I wouldn't use Handbrake as a benchmark for performance across the board and as a comparison for Xeon or any other system. The same goes for the video game titles we hear over and over again.
Handbrake is coded very well, but it's open-source, on version 1.x and took a decade to get out of beta. It also doesn't encode/decode anything but lightweight video formats. And to be honest, most people download it to decode DVDs and remove DRMs. MPEGStreamclip is at least faster at encoding, and Apple's Compressor is even faster and is lighter on the overall system.
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