Analyzing Core i9-9900K Performance with Spectre and Meltdown Hardware Mitigations
 

One of the key aspects of the most recent Intel processor launch, its Core 9th Generation processors, is that the new design affords some hardware-based protection for a couple of the Spectre and Meltdown family of security vulnerabilities. When these vulnerabilities were first discovered, they were patched using a combination of software and firmware, which unfortunately led to some performance regressions over an unpatched processor. The ultimate goal is for a hardware patch, which is always enabled, that loses zero performance – we’re testing out what the new patches have for us today.

https://www.anandtech.com/show/13659...re-mitigations