Strong image block formation

RealESR_Gx4_InputR-50_OutputR-100_Blending-Low

Does anyone else have the same problem, or is there a solution for it?

There are no blocks in the original. 

Hi my friend, 

This occurs when the image exceeds the memory limit selected in the GPU VRAM widget.

This value is set to 4 by default. 

You can increase it if your GPU has more than 4 GB of RAM, and the problem will disappear