Samsung and SK Hynix are at the forefront of CXL (Compute Express Link) memory development, with both companies shipping CXL-enabled DRAM modules for data center memory expansion. CXL is an open interconnect standard that allows CPUs to access external memory pools as if they were local DRAM, enabling memory pooling, disaggregation, and dynamic allocation across servers.
CXL matters because AI and cloud workloads are increasingly memory-bound. A single AI inference server might need terabytes of memory, far more than can fit in a single server's DRAM slots. CXL allows data centers to create shared memory pools that multiple servers can access, dramatically improving memory utilization (from ~50% average to ~90%+) and reducing the total DRAM purchased.
For Korean memory makers, CXL is a double-edged sword: it enables selling higher-margin CXL controllers and modules, but better memory utilization could reduce total DRAM demand. Samsung and SK Hynix are strategically positioning to capture value at the CXL controller and module level, ensuring that even in a disaggregated memory future, Korean companies remain central to the data center memory ecosystem.