Ah, sorry, I didn’t realize that you meant the link to be a generic link to the manual. I’m familiar with the manual. I’m also familiar with the optimization for OpenCL as I’m a long time user of darktable. However, none of changes I make seem to affect the reported memory used. Perhaps I’m reading the recommendations in the manual a bit too literally. However,since you seem to have found the correct optimization to allow 80% OpenCL memory usage with the 1650 Super I’m wondering if you might share them. Thanks.