Not just the POPCNT instruction, does “Windows 11 version 24H2” require a CPU that supports SSE4.2? – Yajiuma no Mori

We previously reported that Windows 11 Insider Preview builds 25905 and later will no longer launch on older systems that do not support the POPCNT instruction, but it appears that a new restriction has been discovered.@TheBobPonyAccording to what he revealed on his “X” (Twitter) account, “Windows 11 Insider Preview” Build 26080 and later requires a CPU compatible with “SSE4.2” to boot the OS.

When he tried it, it worked on a system that did not support SSE4.2. Build 26080 If you try to start it after that, it will automatically restart when it reaches the startup screen.

At the time of writing, the latest build of the branch that is expected to become the “Windows 11 2024 Update” (version 24H2) is Build 26100 . It may be that “version 24H2” cannot use CPUs that do not support “SSE4.2”.

However, as we have said for some time, Windows 11 does not originally support these older CPUs, which were sold more than 10 years ago. Therefore, only a small number of users will be affected by this change. Please be careful if you are forcibly installing Windows 11 on an old PC by circumventing the OS’s CPU requirements.