Incorrect rendering with GPU computing (AMD)

Hello! I was trying to speed up my rendering with GPU computing using Blender 2.79.a but I have a problem. Rendering with my GPU (AMD Radeon R5 M330 2GB) is slower than rendering with CPU (Intel core i5 5200U) and it’s incorrect.




The picture on the left was rendered with GPU. I change nothing between making this two renders (Auto tile size addon actived). Does somebody know how to fix it? I would like to use my graphic card for rendering instead of CPU (I know there are some limitation).
Thank you

According to the Blender Manual, OpenCL rendering in Cycles only support graphics cards with GCN architecture 2.0 and above.
From what I could find out online, your card’s architecture is only GCN 1.0…

Good morning,
I’ve got the same problem and I’d like to find a solution.
There is some way to pass through this problem?
But I think that there isn’t:no:
Francesco