https://wccftech.com/multi-gpu-checkerboard-rendering-silently-added-by-nvidia/

Multi-GPU configurations aren't very popular these days, that's for sure. It doesn't mean NVIDIA isn't working to provide improvements to SLI users, though.

3DCenter user Blaire, creator of the popular SLI Compatibility Bits Thread on that forum, recently discovered that NVIDIA introduced Multi-GPU Checkerboard Rendering with a recent driver release.