9.3 NVLink-C2C: A Coherent Off Package Chip-to-Chip Interconnect with 40Gbps/pin Single-ended Signaling
Ying Wei, Yi Huang, Haiming Tang, Nithya Sankaran, Ish Chadha, Dai Dai, Olakanmi Oluwole, Vishnu Balan, Edward Lee · 2023
NVLink-C2C is the enabler for Nvidia's Grace-Hopper and Grace Superchip systems, with 900GB/s link between Grace and Hopper, or between two Grace chips. The connection provides a unified, cache-coherent memory address space that combines system and HBM GPU memories for simplified programmability. This coherent, high-bandwidth, low-power, low latency connection between CPU and GPUs is key to accelerating the most complex AI and HPC workloads.