Edition Phoronix tested the performance of Intel and AMD after the installation of the patches to calculate how much work the CPU is affected by measures taken by manufacturers to protect users from attacks like Fallout, Zombieload and RIDL.

Analysts have come to the conclusion that the patches do cause noticeable performance degradation of the affected devices. The Intel processors suffer the most — with the included Hyper-threading technology (HT) performance drops by 16%.

For comparison, the AMD lose only 3%.

By the way, Intel drop power even more if Hyper-Threading is not used. HT is disabled, for security reasons, so do some companies, including Apple.

According to the researchers Phoronix, with disabled HT technology, the performance of Intel fell by almost 50%.

In addition to the patches to MDS such attacks, like Fallout, Zombieload and RIDL, employees Phoronix also tested updates that protect users from the previous generation vulnerabilities in CPUs Spectre and Meltdown.

In the end, it turned out that the CPU from AMD are in a more advantageous situation, since users do not need to disable Multi-Threading (SMT, analog of Hyper-threading from Intel), because this technology does not create additional security risks.

And users Zen-processors are generally unlikely to feel any difference.

Recall that the experts have identified a new vulnerability attack side channel. The problem, named Zombieload affects Intel processors and allows to intercept data processed by the CPU. Experts compare Zombieload with the Meltdown, Spectre and Foreshadow.

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