What is the chart for? The chart seems a bit nebulous because people run what computer they can afford. That was as true in the 90s as it is today.

Back in the 90s, some school districts were bleeding edge, depending on how their budgets worked, while other school districts weren't. Then it depended on which department you were in. When I was in HS in the 90s, I had a shop teacher buy a whole room of TOP OF THE LINE cad machines for the students.

Then on the home front, it depended on when you bought a new PC. Not everyone could afford a new PC, so some people had a year old computer. Then it depended on what crowd you ran with. All my friends were pretty bleeding edge and had some awesome rigs. In 1999, I was running a Dual Procesor PII machine. Asus P2B-D had the 440BX chipset.

As for today, I see people running 10-year-old computers that does exactly what they need them to do. For school computers, a lot of them hand chrome books, and then in some families, the only computer they have is the chrome book or their phone.

On another note for today, I can remember in the 90s you'd buy a new computer every year because the new ones were so much better. Today, a lot of people are going longer and longer with their computers because they don't need to upgrade them as fast. They work just fine.