Windows 11 from Microsoft preview update KB5079391, Released March 26, adds support for previous screen refresh rates 1,000Hz, with internal documentation confirming that the limit extends to 5,000 Hz. Microsoft removed the update on March 27 after some installation issues were found. The listed improvements are expected to be available to users in a future release.
The update applies to Windows 11 versions 25H2, 24H2, and 26H1.
According to a publication by blur hunterswhich was the first to identify support for 5000Hz refresh rates, the site’s founder Mark Rehjon helped convince Microsoft to increase the maximum refresh rate to that level. Microsoft’s update notes simply mention support for “refresh rates greater than 1000 Hz” without specifying an upper limit.
Display and UI changes in Windows 11 KB5079391 update
In addition to supporting higher refresh rates, the update brings several other changes related to display performance: it improves auto-rotate and HDR reliability, and improves the power efficiency of monitors connected via USB4.
The update also introduces detailed image descriptions for Co-pilot and Copilot+ PC when using Narrator. Additionally, the layout of the dialog boxes in the Accounts settings menu has been adjusted in the Other section.
Why Windows 11 now supports refresh rates of up to 5000 Hz
At CES 2026Acer, AOC and Philips revealed gaming monitors with 1,000Hz refresh rates running in HD resolution (720p). Blur Busters reports that several manufacturers plan to introduce 2000Hz visualization panels by 2030. This suggests that the 5,000Hz The cap on Windows 11 is intended to make room for hardware advancements in the coming years.
Previous versions of Windows did not support refresh rates higher than 1000 Hz. Supporting these newer displays would require a future operating system update.
KB5079391 Installation and future deployment issues
Microsoft withdrew KB5079391 on March 27, just one day after its release, due to undisclosed installation flaws. The company has not announced when a revised version will be available. Users who did not install the update before it was pulled will receive the included changes when Microsoft releases it again.
