Officially, 10-11 years ago. (This first 5Ghz CPU wasn't that impressive, and part of the reason "chasing Mhz" started to fade into irrelevance.)
For modern AMD, it wasn't until 2022 that they ventured back across 5Ghz, but this time it's much more impressive.
https://www.theverge.com/2022/5/23/23137217/amd-ryzen-7000-c...
Officially, 10-11 years ago. (This first 5Ghz CPU wasn't that impressive, and part of the reason "chasing Mhz" started to fade into irrelevance.)
For modern AMD, it wasn't until 2022 that they ventured back across 5Ghz, but this time it's much more impressive.
https://www.theverge.com/2022/5/23/23137217/amd-ryzen-7000-c...