The Mitigation Impact Difference On AMD Ryzen 9 3900X vs. Intel Core i9 9900K Performance

Of the 322 benchmarks originally carried out, there were about 75 of them (mostly all what's shown in this article) where a recordable change was found when booting these two CPUs with "mitigations=off" to avoid those performance penalties. With the 322 tests geometric mean for the Core i9 9900K it meant a 5.7% difference and 3.8% for the Ryzen 9 3900X. Now if just looking at the geometric mean for the affected workloads:

It was a 12% improvement for the Core i9 9900K in affected workloads by booting with "mitigations=off" on Linux 5.3 under Ubuntu 19.10. In the case of the Ryzen 9 3900X was a 4.5% difference. Notable with this overview though is that without mitigations, the Core i9 9900K comes out just ever so slightly ahead of the Ryzen 9 3900X. rather than losing by about 6%.

In those affected tests, the Core i9 9900K without mitigations won just over half the time.

As always, if you appreciate the relentless Linux benchmark, consider going for premium.