Windows 11’s first update makes AMD CPU performance even worse


AMD warned last week that its chips are experiencing performance issues in Windows 11, and now Microsoft’s first update to its new OS has reportedly made the problem worse.

TechPowerUp reports that it’s seeing much higher latency, which means worse performance, following the Windows 11 update going live yesterday.

AMD and Microsoft found two issues with Windows 11 on Ryzen processors. Windows 11 can cause L3 cache latency to triple, slowing performance by up to 15% in certain games. The second issue affects AMD’s preferred core technology, that shifts threads over to the fastest core on a processor. AMD said this second bug could impact performance on CPU-reliant tasks.

TechPowerUp measured the L3 cache latency on its Ryzen 7 2700X at around 10ns, and Windows 11 increased this to 17ns.  “This was made much worse with the October 12 ‘Patch Tuesday’ update, driving up the latency to 31.9ns,” said TechPowerUp.

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