170-250ns was what they were saying a year ago, which they were saying was 2x native latency. https://www.servethehome.com/compute-express-link-cxl-latenc...

But with Genoa for example, socket to socket latency has climbed up to 220ns, and going across nodes on a socket is 110ns. I feel like CXL will be less than 2x a hit, if only because cores themselves are having higher and higher latencies. https://chipsandcheese.com/2023/07/17/genoa-x-server-v-cache...