Microsoft's Windows 11 preview update KB5079391 was released on March 26 and enabled support for refresh rates above 1,000Hz. Internal documentation confirmed that this limit extends up to 5,000Hz. The update was pulled by Microsoft on March 27 after some installation issues were detected. The listed improvements are expected to be available in a future release for users.

The update applies to Windows 11 versions 25H2, 24H2, and 26H1.

According to a post by Blur Busters, Mark Rehjon, the founder of Blur Busters, which is the first site to support 5,000Hz refresh rates, convinced Microsoft to raise the maximum refresh rate to this level. Microsoft's release notes state that it supports refresh rates only above 1,000Hz without specifying an upper limit.

Screen and Interface Changes in Windows 11 Update KB5079391

In addition to supporting higher refresh rates, the update brings several other changes related to screen performance: It enhances auto-rotation and HDR reliability and improves energy efficiency for monitors connected via USB4.

Additionally, the update provides detailed image descriptions for Copilot and Copilot+ PCs when using Narrator. Furthermore, the design of dialog boxes in the Accounts settings menu has been adjusted in the Other section.

Why Does Windows 11 Now Support 5,000Hz Refresh Rates?

At CES 2026, Acer, AOC, and Philips showcased gaming monitors with a refresh rate of 1,000Hz running at HD (720p) resolution. Blur Busters reported that many manufacturers plan to introduce 2,000Hz screen panels by 2030. This suggests that the 5,000Hz limit in Windows 11 was set to leave room for hardware advancements in the coming years.

Previous versions of Windows did not support refresh rates higher than 1,000Hz. Supporting these new displays will require a future update to the operating system.

KB5079391 Installation Issues and Future Distribution

Microsoft pulled KB5079391 on March 27, just one day after its release, due to undisclosed installation errors. The company has not yet announced when a revised version will be available. Users who did not install the update before it was pulled will receive the changes included when Microsoft re-releases it.