I don’t know what you mean by a non-commercial card,  but I’m running Open CL 
for dt just fine on a radeon 6850

My recommendation is to look at phoronix or elsewhere that provide Linux OpenCL 
benchmarks and check just how good whatever card you are considering is for 
OpenCL.  If it doesn’t run at all you have your answer ...

From: Corey Poore [mailto:coreypo...@controlcam.com]
Sent: 13 April 2015 13:03
To: darktable-users@lists.sourceforge.net
Subject: [Darktable-users] Using Radeon GPU

I would like to use Darktable to convert NEF images to TIF images and take 
advantage of openCL. The problem I'm running into and its mostly my fault is I 
don't know if image conversion in this actually leverages openCL or not. I 
found that the nvidia support is only for the commercial cards as far as driver 
support is concerned. Will I be able to use OpenCL on a non-commercial radeon 
card such as an R9-280?

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