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More about 2019 Mac Pro vs iMac 5K vs iMac Pro...
2013 Mac Pro: SHA1 Cryptographic Hash Speed
The SHA1 cryptographic hash* is a compute intensive job with modest memory access so it tends to scale very well across multiple CPU cores.
* Test here from MemoryTester 'mt compute'.
See the test machine configurations.
Times (in seconds here) reflect the time needed to complete a fixed amount of hashing work (BitCoin fans take note).
The 8-core 2013 Mac Pro is about 10% faster with a few cores, but the gap closes until near parity is reached at 8 cores (within measurement error).
At 9 cores and beyond the 12-core 3.33 GHz 2010 Mac Pro pulls ahead, but only by about 24% at 12 cores.
The 6-core 3.5 GHz Mac Pro lags the 8-core 3.3 GHz, which can be expected from slightly higher Turbo Boost on the 8-core. But the 3.0 GHz 8-core would run neck and neck with the 6-core.
The crossover point for the 12-core 2013 Mac Pro is 8 cores to match the Apple stock 3.5 GHz 6 core and 11 cores to match the 3.3 GHz 8-core.
Vertical scale below is 12...1 CPU cores. Horizontal scale is time in seconds to complete a fixed-size job.