Coremark benchmark degradation on HiFive Unmatched

HiFive Unmatched
2

The output of that command here is

$ uname -r
5.13.9-00012-g71cf60a44907
$ ./coremark.exe 
2K performance run parameters for coremark.
CoreMark Size    : 666
Total ticks      : 13309
Total time (secs): 13.309000
Iterations/Sec   : 4508.227515
Iterations       : 60000
Compiler version : GCC10.3.0
Compiler flags   : -O2 -DPERFORMANCE_RUN=1  -lrt
Memory location  : Please put data memory location here
                        (e.g. code in flash, data on heap etc)
seedcrc          : 0xe9f5
[0]crclist       : 0xe714
[0]crcmatrix     : 0x1fd7
[0]crcstate      : 0x8e3a
[0]crcfinal      : 0xbd59
Correct operation validated. See README.md for run and reporting rules.
CoreMark 1.0 : 4508.227515 / GCC10.3.0 -O2 -DPERFORMANCE_RUN=1  -lrt / Heap

Mine is running at 1.4Ghz so Coremark/MHz is 3.2. Still, not close to the 5.1 reported on that page. I wonder under what conditions it was measured.

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