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http://www.nvidia.com/object/nvlink.html - NVIDIA® NVLink™ is a high-bandwidth, energy-efficient interconnect that enables ultra-fast communication between the CPU and GPU, and between GPUs.

And a big on the PowerPC roadmap http://www.nextplatform.com/2016/04/07/ibm-unfolds-power-chi... "With NVLink, multiple GPUs can be linked by 20 GB/sec links (bi-directional at that speed) to each other or to the Power8 processor so they can share data more rapidly than is possible over PCI-Express 3.0 peripheral links. (Those PCI-Express links top out at 16 GB/sec and, unlike NVLink, they cannot be aggregated to boost the bandwidth between two devices.)"