HP 128GB 4800MHz DDR5 PC5-38400 ECC Registered CL40 288-Pin DIMM 1.1V Dual Rank x4 Memory Module – P69974-B21

HPE P69974-B21 128GB DDR5-4800 ECC RDIMM — 2Rx4 Server Memory

The HPE P69974-B21 is a 128GB DDR5-4800 ECC Registered DIMM — a standard HPE option kit (-B21) variant providing dual-rank x4 server memory at 4800MHz (PC5-38400) with CL40 latency and 1.1V operation for HPE ProLiant Gen11 servers. Functionally equivalent to P71560-001 and P69982-B21, providing an additional HPE channel ordering option for 128GB DDR5-4800 RDIMM on Gen11.

Key Features

• 128GB DDR5-4800 ECC RDIMM — 2Rx4 option kit (-B21) for HPE Gen11 channel procurement
• CL40 at 4800MHz (PC5-38400) with on-die ECC for dual-layer DDR5 reliability
• 1.1V low-voltage for energy-efficient 128GB per-slot DDR5 deployment on Gen11
• Registered buffer for RDIMM-standard HPE ProLiant Gen11 DIMM slot compatibility
• Interchangeable with P71560-001 and P69982-B21 in supported HPE Gen11 servers

Product Specifications

• Part Number: P69974-B21
• Manufacturer: HP / HPE
• Capacity: 128GB
• Type: DDR5 ECC Registered DIMM (RDIMM)
• Speed: 4800MHz (PC5-38400)
• CAS Latency: CL40
• Voltage: 1.1V
• Ranks x Width: 2Rx4
• Pins: 288-Pin

Memory Specifications

• ECC: Yes — On-Die ECC + ECC Registered
• Form Factor: DIMM (288-pin, DDR5)
• Error Correction: On-die ECC plus SECDED at memory controller
• Memory Standard: PC5-38400 (DDR5-4800)

Performance Specifications

• Bandwidth: Up to 38,400 MB/s theoretical peak per channel
• ECC Type: On-Die ECC (ODECC) + Registered SECDED
• RAS Features: On-die ECC, memory mirroring, sparing (platform dependent)

Use Cases

• 128GB DDR5-4800 RDIMM channel option kit for HPE ProLiant Gen11 server procurement
• Maximum 128GB DDR5 per-slot capacity for SAP HANA, AI inference, and large VM consolidation
• Alternative procurement option to P71560-001 and P69982-B21 for Gen11 128GB DDR5 RDIMM
• High-bandwidth large-capacity DDR5 for virtualization and in-memory database on Gen11

Compatibility

• HPE ProLiant Gen11 servers with DDR5 DIMM slots supporting 128GB RDIMM per slot
• Requires Intel Xeon Scalable 4th Gen (Sapphire Rapids) or AMD EPYC 9004 series processors
• Not compatible with DDR4 DIMM slots — DDR5 uses incompatible 288-pin keying
• Interchangeable with P71560-001 and P69982-B21 per HPE Gen11 QuickSpecs

Frequently Asked Questions

What is the difference between P69974-B21, P71560-001, and P69982-B21?

All three are 128GB DDR5-4800 ECC 2Rx4 CL40 RDIMMs at 1.1V for HPE ProLiant Gen11 — functionally identical with different HPE procurement suffixes. P69974-B21 and P69982-B21 are both -B21 option kit variants (different catalog entries), while P71560-001 is the OEM factory variant. All are interchangeable in supported HPE Gen11 servers.

When would I choose P69974-B21 over P69976-B21 for 128GB DDR5?

P69974-B21 is DDR5-4800 (38,400 MB/s) while P69976-B21 is DDR5-5600 (44,800 MB/s). Choose P69974-B21 when your HPE Gen11 server platform supports DDR5-4800 and you do not need the additional 17% bandwidth of DDR5-5600. For platforms with 5th Gen Intel Xeon (Emerald Rapids) supporting DDR5-5600, P69976-B21 provides higher throughput for bandwidth-sensitive workloads.

How many P69974-B21 modules does an HPE DL560 Gen11 support?

The HPE DL560 Gen11 (4-socket) supports up to 32 DIMM slots per configuration (varies by processor count and riser setup). With 32 x 128GB DDR5-4800 RDIMMs, the DL560 Gen11 can achieve up to 4TB of DDR5 memory. For maximum Gen11 memory density, consult HPE”s DL560 Gen11 QuickSpecs for the exact DIMM slot count and supported per-slot capacity.

The HPE P69974-B21 delivers 128GB DDR5-4800 ECC RDIMM capacity in a 2Rx4 configuration as an additional HPE option kit procurement path — providing the same maximum 128GB DDR5 per-slot density as P71560-001 and P69982-B21 for HPE ProLiant Gen11 servers requiring high-bandwidth, high-capacity DDR5 memory for SAP HANA, AI inference, and large-scale virtualization workloads.