It was discovered recently that AMD's Athlon 200GE processor, which is regarded as a great budget option, can actually be overclocked despite being officially a locked part. Overclocking enthusiasts discovered that MSI, perhaps by accident, allows the 200GE to be overclocked on its B350M Gaming Pro motherboard.
https://www.notebookcheck.net/AMD-s-cheap-Athlon-200GE-can-be-overclocked-on-MSI-s-B350M-Gaming-Pro.373246.0.html