MojoKid writes: There was quite a stir caused recently when it was determined that Microsoft would only be fully supporting Intel's Kaby Lake and AMD's Zen next-generation processor microarchitectures with Windows 10. It's easy to dismiss the decision as pure marketing move, but there's more to consider and a distinction to be made between support and compatibility. The decision means future updates and optimizations that take advantage of the latest architectural enhancements in these new processors won't be made for older OS versions. Both of these microarchitectures have new features that require significant updates to Windows 10 to optimally function. Kaby Lake has updates to Intel's Speed Shift technology that make it possible to change power states more quickly than Skylake, for example. Then there's Intel's Turbo Boost 3.0, which is only baked natively into Windows 10 Redstone 1. For an operating system to optimally support AMD's Zen-based processors, major updates are likely necessary as well. Zen has fine-grained clock gating with multi-level regions throughout the chip, in addition to newer Simultaneous Multi-Threading technology for AMD chips. To properly leverage the tech in Zen, Microsoft will likely have to make updates to the Windows kernel and system scheduler, which is more involved than a driver update. Of course, older versions of Windows and alternative operating systems will still install and run on Kaby Lake and Zen. They are x86 processors, after all.