How does Marmoset Render Engine Work? (Grainy/Pixelated results)

Mohamed_Salah_Bchir

So, how do I get a clean render? Do i wait for it to "res up"?
My only explanation for the results i get is that my computer is weak. i5 cpu 4gb of ram and Geforce gt600 series. is that the case?
If you zoom in you can see the grains, especially in the shadows.
Imgaes https://imgur.com/a/NLmNsCk

EarthQuake

Some render effects like Local Reflfections and dithered transparency will show up grainy in the viewport, but will improve when you make renders (from the Capture menu). You can improve grain/noise by going to Capture - Settings (Ctrl+P) and increasing the Sampling.

Global Illumination quality can be improved by increasing the Voxel Resolution setting to High in the Render settings. This can make your scene run slow on older hardware or with complex scenes though. One way to combat this is to turn on Speedy Mode in the viewport (the rocket ship icon below the Camera and Render icons in the top left corner of viewport. This will disable expensive rendering effects, but they will still be enabled when you capture a render.

Mohamed_Salah_Bchir

Thank you that's very helpful