Provided is a plot of voltage and clocks through some random encounters in Tales of Zestiria, a low GPU usage JRPG (Japanese RPG). The data for these plots was logged using GPU-Z, which is an absolutely great tool. I strongly recommend using GPU-Z, MSI-Afterburner, or Sapphire TriXX to verify your clock speeds in games.
An extended length of time was run for ClockBlocker being disabled, as there is little to show during it being active (as intended). A small overclock has also been done for the sake of making things more interesting ... well, for myself anyway (no added voltage though). Bottom line, you can use ClockBlocker to eliminate clock jitter in many games such as this one shown here on your high end AMD graphics card.