Perhaps it’s the lack of a really nice, new GPU? I’m still rolling with a 550Ti (10 years old kind of a thing which offers no CUDA/OpenCL) but after a few tests I cranked up the render samples in Cycles to 1024, waited about 20 minutes and this is what my PC gave me.
It’s pretty nice, no doubt but why is it still a bit grainy? Lighting, Specular settings perhaps or??? Be nice to figure this one out.