alt Hacker NewsTo someone not familiar with CXL that still gives the wrong impression. As far as I have seen, CXL is supposed to be cache coherent, and should require less invasive rework (if any at all) of applications to take advantage of it; that's part of the enablement of memory disaggregation that CXL is pushing towards (similar to the storage disaggregation push a decade or so ago).
True, but it’s still another level of NUMA with lower throughput and higher latency. In consumer boards with limited extra high speed lanes it could be a lot slower than main DDR5 RAM. Wouldn’t be fun to have your game or app run a lot slower if it happened to be loaded into the wrong part of memory.