Events of the past week have drawn into sharp focus the likely result of next month’s patching cycle. If you have a Windows 7 or 8.1 PC that you bought, built, or upgraded in the past year or so, it would behoove you to understand exactly what Microsoft plans.

Many people — I’ll raise my hand here — thought that Skylake-based computers would continue to receive Windows 7 and 8.1 patches until the respective end-of-life. We are wrong.

Let’s start with the basics. Intel introduced its so-called 6th Generation Skylake processor in August 2015. It slowly replaced the older Broadwell series, all of which will continue to work with Win7 and 8.1. Skylake now is slowly being replaced by 7th Generation Kaby Lake processors, which will not get Win7 or 8.1 support from Microsoft. To date, Intel has released 50 or so different Skylake processors. There are also dozens of Kaby Lake processors, which were introduced in August 2016.

On the AMD side there’s a distinction made between the older Opteron series, the APU series (which includes Kaveri, Carrizo, and Bristol Ridge processors, named Athlon, Sempron, A4, A6, and E4) and the brand-new Ryzen processors, which are only now appearing on store shelves. Most observers say that 7th Generation AMD chips start with the Bristol Ridge APUs, which appeared in May, 2016. There’s no change at all between the core architecture of the Carrizo and Bristol Ridge chips.