A-Tech 64GB DDR4 2133 ECC LRDIMM 4Rx4 for HP 726724-B21 752373-091 752373-G91 774176-001 M4Z04AA server RAM

64GB DDR4 2133 ECC LRDIMM

This 64GB DDR4 2133 ECC LRDIMM module uses a 4Rx4 load-reduced design to deliver high-density memory for HP server and workstation platforms. It targets administrators who need maximum capacity per slot in systems qualified for part numbers such as 726724-B21, 752373-091, 752373-G91, 774176-001 and M4Z04AA. The stick runs at 1.20V with CL15 latency and is built with major-brand chips.

Installing in validated HP slots

Installation follows the standard 288-pin DIMM procedure: align the key notch, press firmly until the ejector tabs click, and confirm seating visually. Load-reduced modules draw less current per rank than standard registered DIMMs, but they still require the platform to support LRDIMM topology; inserting one into a board that only accepts RDIMM will prevent boot. Always verify the system memory guide before purchase because unsupported configurations are the most common cause of post failures.

DDR4 2133 bandwidth and rank limits

The DDR4 2133 interface provides 17000 MB/s theoretical throughput per module, which caps memory bandwidth regardless of how many ranks are populated. A 4Rx4 organisation increases density but also adds electrical load, so the memory controller may reduce clock speed when multiple high-rank modules fill every channel. Buyers needing higher frequencies or lower latency than PC4-17000 should look for platforms and modules rated beyond the DDR4 2133 standard.