OWC 64GB (4x16GB) DDR4 2400 PC4-19200 CL17 1Rx4 288-pin 1.2V ECC Registered RDIMM memory upgrade

Purpose-built server upgrade

This 64GB kit contains four 16GB DDR4 2400 registered ECC DIMMs validated for the Cisco UCS C240 M4. It targets administrators who need to expand memory capacity in that specific rack server without mixing registered and unbuffered modules. The PC4-19200 CL17 specification matches the platform's native memory speed.

Compatibility checks before ordering

Verify that every installed DIMM slot currently uses registered ECC memory; mixing with unbuffered or load-reduced types will prevent boot. Confirm the system requires 1.2V DDR4 2400 modules and that the motherboard accepts 1Rx4 organisation across all channels. Cross-reference the Cisco part numbers UCSMR1X161RVA and UCSMR1X161RVG to ensure an exact replacement.

Build integration notes

The kit occupies four 288-pin DIMM slots and delivers 64GB of registered ECC capacity for multi-threaded workloads. No heat spreaders are fitted, so airflow across the modules must be maintained by the server's standard cooling design. Registered buffering reduces electrical load on the memory controller, freeing headroom for additional DIMMs if the platform supports higher population counts.