The speculation comes from @LeaksApplePro, which says that at least three Mac Pro configurations will arrive next year, featuring Arm-based SoCs that mix performance and efficiency cores, much like the M1. The rumored flagship comes with a monstrous 64 CPU cores (48 of which will be powered), 512GB of RAM, 128 GPU cores, and starts at €16,000
Sixteen grand is a lot of money, but the Mac Pro is usual. You could spend more than $50,000 on a top-spec Xeon powered current model, and that’s without the $5,000+ Pro Display XDR and $700 wheels.
The middle configuration includes 48 CPU cores (36 performance), 256GB of RAM, 64 GPU cores, and starts at $12,000. Meanwhile, the cheapest choice is 32 core CPUs (24 performance), 64GB RAM, and 32 core GPUs. It starts at $5,499, which is around $100 less than the new Mac Pro base model.
Apple has spent years trying to reduce its dependence on Intel, and with the popularity of the M1, we can definitely expect its in-house chips to start appearing soon enough on more Macs; that’s partly why the iMac Pro has been discontinued. But the specs here are supposed to be taken with a large grain of salt. One Twitter user noted that a 64-core Mac Pro desktop is unlikely to need 16 efficiency cores, adding that all versions are likely to feature only four or eight of these low-power cores.