Intel Core i5 8400 vs. i5 9400F Meltdown/Spectre/L1TF/MDS Mitigation Impact

Written by Michael Larabel in Processors on 5 June 2019. Page 6 of 6. 21 Comments

The web browser performance is also similarly still affected even with the initial hardware mitigations present for the Core i5 9400F.

Going into this I was expecting to see the Core i5 9400F possibly having a bit smaller delta in the performance as a result of the Meltdown hardware mitigations and the start of other architectural improvements, but at least in these affected workloads the hit was similar to that of the Core i5 8400.

If taking a look at the geometric mean across the dozens of benchmarks carried out, both the Core i5 8400 and i5 9400F basically have around 18% lower performance from these default/out-of-the-box mitigations on Linux systems for Meltdown, Spectre, L1TF/Foreshadow, and MDS/Zombieload. Those wanting to dig more into these numbers and some additional data points can do so via this result file.

If you enjoyed this article consider joining Phoronix Premium to view this site ad-free, multi-page articles on a single page, and other benefits. PayPal or Stripe tips are also graciously accepted. Thanks for your support.

Related Articles
About The Author
Michael Larabel

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, LinkedIn, or contacted via