Does AMD's 'Personal AI Era' hold up? I built a machine to test it

Seeing that AMD is attending IFA 2026 and Jack Huynh will be giving a keynote on the "Era of Personal AI," my first reaction was: this term sounds familiar, but nobody has clarified what hardware "Personal AI" actually runs on. Coincidentally, I built a new machine last week using a Ryzen 7 9700X paired with a B650 motherboard, which is a typical combo for AMD's current mainstream platform. I'll share my usage experience from running it for a week.