As of the "Crimson" drivers, the Radeon settings tool now includes an option called "Frame Rate Target Control". Is this capping or something else entirely?
Topic on Glossary talk:Frame rate (FPS)
Frame Rate Target Control via Radeon Settings
It's capping, however I believe it isn't as good as capping through e.g. RTSS or similar third-party alternatives. Battle(non)sense goes through it in one of his videos, screencap for easier viewing: https://i.imgur.com/M3KQ5bU.png
The video (can't link it cuz PCGW is broken) is FreeSync vs. G-Sync Delay Analysis, and the screencap is from 15:15.