OWC 8GB DDR3 1333 ECC Registered RDIMM 1R3D32R408GB memory upgrade

Server ECC RDIMM upgrade

This OWC module is an 8 GB DDR3 1333 ECC Registered DIMM built for HP ProLiant DL585 G7, ML370 G6, SL160s G6 and SL160s G7 servers. It runs at 1.5 V with CL9 latency and a 2Rx4 organisation. The registered design adds a buffer that stabilises the signal on heavily populated memory buses. It replaces several HP part numbers including 500662B21 and 593913B21.

Verify registered ECC requirement

Before ordering confirm that your system requires registered ECC memory and that the motherboard accepts 240-pin DDR3 RDIMMs at 1333 MT/s. This module will not work in desktop boards that take unbuffered DIMMs and it cannot be mixed with unbuffered memory in the same server. Check the service manual for the maximum supported capacity per slot and the total number of populated channels. The part number 1R3D32R408GB matches the listed ProLiant models exactly.

Steady server workload behaviour

Under sustained load the registered buffer helps maintain signal integrity across multiple ranks, reducing electrical stress on the memory controller during long compute runs. ECC corrects single-bit errors on the fly so data integrity is preserved during extended virtualisation or database tasks. The module has no heat spreader, so adequate chassis airflow is needed to keep temperatures stable over hours of continuous operation.