Yes, that can definitely cause that. Reset the clocks back to stock and check whether it fixes the issue or not.
Also check whether your GPU is overheating or not by running HWinfo in the background. That could also cause the graphical artifacts.
PS userbenchmark is pure garbage and not worth using, it is even banned in most tech subreddits.
Have not used one in years after i almost melted a machine from one, so to be honest wouldnt even know now days. That was an HP with AMD it ran hot constantly brand new out of the box, check thermal paste drivers and firmware was up to date, ended up sending it back and getting an Asus Rog with intel.
A lot has changed since the launch of Ryzen CPUs. AMD has overthrown Intel as the new efficiency king, it's not even a contest right now when testing efficiency under load like rendering, gaming, etc. On the other hand Intel still has the advantage in idle power consumption though because of the use of chiplet design by AMD.