@graf @Aether
I never had contact with one of these. I'm a millennial that had a computer kinda late. So you're welcomed to correct me. It's just what I understood from videos explaining old PCs. My understanding was that at the time a new CPU came out that had higher clock speed, but old software/games was locked to the old CPU clock speed. So the Turbo button downclocked the newer CPU to old clock speeds for that software.