Hi again,
Yes, I've got 64bit OS and SU, I use RT GPU CUDA for rendering. I've changed Dynamic Memory Limit to '0' and it helped a bit but I'm still not able to make more than 1920x1080px image.
I've tried to render to VRimage and still the same problem. I turned of default displacement too. No idea what else can I fix.
If you think there's any other solution, please help me.