Control and power-management chips that DDR5 server memory modules must carry, including register clock drivers and module PMICs. They sit between leading-edge logic fabrication and memory module assembly, and their supply can limit module shipments even when DRAM die is available.
A sustained tight read means module-level control and power chips, not DRAM die, set how many DDR5 server modules can be assembled. Die can be available while finished modules wait on the register and power-management parts each module must carry. These parts draw on leading-edge logic capacity, so relief arrives only as more of that capacity is secured and the chips qualify onto modules, over quarters rather than a single order cycle. The read is supplier revenue, a proxy that tracks how hard that capacity is worked, not module output directly.