It depends on the configuration, base models are 7 core GPU, anything above that is 8.
However it doesn't appear LumaFusion utilizes GPU cores for video file export or compression, only for playback... one reason we can be confident with that opinion is render times when benchmarked on the 2018 iPad Pro (7 GPU cores) vs the 2020 iPad Pro (8 GPU cores) show absolutely no differences. So that extra core doesn't appear to make any difference.
That said, I imagine Luma could update and leverage the GPU cores for additional export performance. At the cost of heat and battery though.
I think what is shown in this videos is pretty decent... we will see Geekbench scores through the roof on the M1 compared to the A12Z, but we won't see those drastic increases when comparing functional productivity applications. It's no different on desktop computers... often times benchmarks will show unbelievable increases in performance that just don't fully realize on workloads. It's normal.
Technically, you can customize the base models so you can get, for example, 8C/7C/16GB/1TB. The difference between the same config M1 MBA 8C/7C and 8C/8C is $50.
As for functional productivity, I think improved external display support via Thunderbolt might be one of the M1 exclusive features we'll see. Hopefully, developers get onboard quickly. Come on Microsoft, I'd like to be able to use Excel with proper, extended dual monitor on the iPad Pro. Pivot Tables, too.
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