I am new to this forum and pretty much new to blender rendering.

When I initially started, I could render with GPU, but now I can only do it with my CPU, which I don't prefer.

When I try the GPU, my blender goes slow/freezes and it would take way too long to finish.

Here are my iMac Specs

macOS Sierra iMac Retina 5k, 27in, Late 2015 Processor 4 GHz Intel Core i7 32 GB 1867 MHz DDR3 Graphics AMD Radeon R9 M395X 4096 MB

Is there something I need to do or install, or does blender not support what I have :-/


  • $\begingroup$ Radeon R9 have a long history of problems with blender. see: blender.stackexchange.com/search?q=R9 most of them seem to point at the drivers for such cards. Search through those questions for a possible solution. $\endgroup$ – user1853 Nov 28 '16 at 17:02
  • $\begingroup$ Appreciate your help and prompt response! $\endgroup$ – cndyboom Nov 28 '16 at 17:50
  • $\begingroup$ "When I initially started, I could render with GPU, but now I can only do it with my CPU" What have you done in the meantime, or what changes that might have caused it to stop working? $\endgroup$ – Duarte Farrajota Ramos Nov 29 '16 at 1:31
  • $\begingroup$ I wish I could remember. I stopped using it for a couple of months and when I went to render a project again, it started working differently. $\endgroup$ – cndyboom Nov 29 '16 at 2:41
  • $\begingroup$ I use different Radeons and especially different R9s on several computers (Windows and Linux) without problems. Most likely a MacOS update, since it's quite common that Apple breaks small things with big consequences. I developed a small audio tool for MacOS and abandoned it (and Apple/MacOS in general) in 2009 because of those update issues. $\endgroup$ – metaphor_set Mar 24 '18 at 14:50

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