It's been a while since I've tried to run it, but it's a mix of Nvidia and AMD GPUs and only AMD CPUs (everything portable is all AMD though and that's where my gripes are.) I'm sure the opencl backend has gotten better over time, but it always seems to drag behind the cuda backend. At this point I wish we could just have a vulkan backend and be done with it.

Thanks for bringing that up though, after a quick search that I guess I haven't done in a long time, it appears that colmap does now have a hip backend. So I guess that's going to be my weekend now.