Interesting results. Hardware mitigation was one of the reasons I got interested in building a new AMD system (hopefully my 3900X arrives in time for the weekend):
Spectre Mitigation Performance Impact Benchmarks On AMD Ryzen 3700X / 3900X Against Intel https://www.phoronix.com/scan.php?page=article&item=amd-zen2-spectre&num=1
Spectre Mitigation Performance Impact Benchmarks On AMD Ryzen 3700X / 3900X Against Intel https://www.phoronix.com/scan.php?page=article&item=amd-zen2-spectre&num=1