> I don't see that, these two issues adequately explain why so few GPUs have official support.

I'm sorry I don't follow this. Surely if all AMD GPUs have the same problem with atomics then this can't explain why some GPUs are supported and others aren't?

> There is no upside for NVIDIA to do that.

If NVIDIA felt this patent was actually protecting them from competition then there would be no upside. But NVIDIA has competiton from AMD, Intel, Google, and Amazon. Intel have managed to engineer OneAPI support for their GPUs without licensing this patent or relying on PCIe atomics.

AMD have patents NVIDIA would be interested in. For example multi-chiplet GPUs.