MSI Afterburner did not allow me to set clocks higher than 585 (Core) after checking off all the settings for extended overclocking profiles, kernel mode, extended MSI, etc.
and edit my device config with higher values and make it read only. NB! Important to have DEFAULTS higher than other settings, otherwise Afterburner refuses to use them.
The final result is that my HD3650 is stable at 640 Core/540 Mem, but I chose to apply 625/525 for everyday use. With PowerPlay support - so that clocks are dynamically going down when not gaming. MSI Afterburner is set to start minimized with Windows, and apply settings on Start and after Sleep. Seems ideal setup to handover to a kid. OpenGL FX benchmark went from 21 FPS (Stock clocks, 450/410) to 30 FPS. (From 28 to 30 compared to what Afterburner allowed before)