Right you are, 64 bit atomics were added with the Apple8 GPU but only in M-series chips (M2 and up) and then the Apple9 GPU made it universal (A17 Pro and up).

Right you are, 64 bit atomics were added with the Apple8 GPU but only in M-series chips (M2 and up) and then the Apple9 GPU made it universal (A17 Pro and up). https://developer.apple.com/metal/Metal-Feature-Set-Tables.pdf https://developer.apple.com/metal/Metal-Feature-Set-Tables.p...