If you are using V Ray you should use the VRay frame buffer instead. Also it seems you are looking a some sample pass and not the final beauty image.
PLease reset all your render settings to default, your scene should render fine with those.
BTW it seems there is too much light in your scene you need to adjust your exposure and color mapping.
so, the pixelations doesnt happen when i turn off GI. but then ofc my scene gets too dark 🙂 and i did lessen the lights. nothing changes. i am using vray exposure control also.
Could you share that scene? maybe delete all furniture and extra decoration just leave the main architecture part, lights and cameras. That could be easier to debug and see what's the problem.
From the screen shots, is hard to tell what specifically is wong, it may be many things at the same time.
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