https://wccftech.com/intel-xe-coherent-multi-gpu-cxl/

I couldn’t help but notice that in the CXL presentation Intel gave today lies a hint about the future of its Xe GPU ambitions. While it was not explicitly stated anywhere – it seems to have a pretty obvious implication to me; time to coin a term: Coherent Multi-GPU. CXL is Intel’s new interconnect layer that is designed to solve a lot of issues with the PCIe protocol and one of the major reasons why Multi-GPU never took off properly is due to the lack of – you guessed it – coherency. I think it is very likely that we will be seeing Xe GPUs running in “CXL Mode” in the future.

Intel discussed its brand new processor-to-processor interconnect, called the Compute Express Link (CXL), in detail at the ‘Interconnect Day 2019’ event yesterday. Whereas we have talked in depth about data centre interconnects before, this particular one works to connect devices across the physical PCIe port. The reason why I mention physical and not just PCIe is because while Intel CXL is designed to work over the physical PCIe port to ensure universal compatibility – it will not utilize the PCIe protocol but instead act as an alternative protocol to the same; one that is far more future proof and scalable than its archaic (soon-to-be) predecessor.