The Mitigation Impact Difference On AMD Ryzen 9 3900X vs. Intel Core i9 9900K Performance
Written by Michael Larabel in Processors on 9 October 2019. Page 8 of 8. 18 Comments

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.

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Michael Larabel is the principal author of and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and automated benchmarking software. He can be followed via Twitter or contacted via

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