Regardless of whether you are an AMD or NVIDIA fan, the results show overall that Darktable -- and other imaging manipulation programs -- is a great use-case for OpenCL and delivers much better performance than running only on the CPU. Keep in mind the Xeon E3-1280 v5 is a rather high-end Skylake CPU and lower-end Core i3/i5 CPUs would see much lower performance.
If you found these Darktable OpenCL benchmarks interesting and appreciate all of our interesting Linux hardware benchmarks and reviews on Phoronix, consider showing your support by joining Phoronix Premium -- today also happens to be the last day of our current premium holiday special. As the Linux GPU drivers continue to progress and we get our hands on new hardware, expect to find more Darktable benchmarks now that there is the test profile for the Phoronix Test Suite for fully-automating these benchmarks.
If you have Darktable installed and then run the Phoronix Test Suite, it's as easy as running phoronix-test-suite benchmark 1611281-TA-DARKTABLE97 to compare your own system's OpenCL Darktable performance to all the results in this article in a fully-automated, side-by-side comparison.