Yup. There was a great talk at the last GPU tech conference in san jose where a guy from nvidia showed benchmarks of local memory accesses compared to remote (another GPU over nvlink/nvswitch). There was almost no difference once you got to a large enough transfer size, which is the most common. And the beauty was the only difference is the pointer happened to be on another GPU rather than yours. No special programming was required. Of course, this locks you into Nvidia, but their intent is clear with CUDA already.