Microsoft will only support upcoming CPUs on Windows 10, which includes Intel’s Kaby lake, Qualcomm’s 820 and AMD’s Bristol Ridge CPUs.
With this Microsoft no longer delivering any security or bug fixes coming to their older OS’ when using new CPUs, making the OS insecure and unreliable on these new platforms. But Windows 7 will be receiving security updates until January 14th 2020 and Windows 8.1 will receive long term support until 2023, but support will only deliver for older hardware.
“Going forward, as new silicon generations are introduced, they will require the latest Windows platform at that time for support. This enables us to focus on deep integration between Windows and the silicon, while maintaining maximum reliability and compatibility with previous generations of platform and silicon. For example, Windows 10 will be the only supported Windows platform on Intel’s upcoming “Kaby Lake” silicon, Qualcomm’s upcoming “8996” silicon, and AMD’s upcoming “Bristol Ridge” silicon.”
So what does it mean? It means if you want to use a new CPU, you will need to use a new OS. This way Microsoft somewhat forcing users to buy their new OS.