Janusz Biela wrote:Ah single CPU now I see. 
Did you use K3 with denoiser or not yet in this project?
Yes this system has never been suitable for this work  

 still i managed to get something out of it for all these years.  
 
 
Project classic house without denoiser
Project modern house with denoiser
If you look very closely you see the 'oilpainting' effect from the denoiser in the windows, but is normal i guess, with strange reflections and at the same time stuff happening behind the glass i think it is impossible for denoiser to know what to do.
But i render all my images at 3,5K resolution.