HP 128GB 5600MHz DDR5 PC5-44800 ECC Registered CL46 288-Pin DIMM 1.1V Dual Rank x4 Memory Module – P71561-001

HPE P71561-001 128GB DDR5-5600 ECC RDIMM — 2Rx4 Server Memory

The HPE P71561-001 is a 128GB DDR5-5600 ECC Registered DIMM providing dual-rank x4 server memory for HPE ProLiant Gen11 servers — delivering CL46 latency at 5600MHz (PC5-44800) with 1.1V operation and on-die ECC. DDR5-5600 represents a higher-speed bin than DDR5-4800, providing increased memory bandwidth for Gen11 servers supporting Intel Xeon Scalable 5th Gen (Emerald Rapids) or compatible processors at 5600MHz.

Key Features

• 128GB DDR5-5600 ECC RDIMM — 2Rx4 at the highest standard DDR5 speed for Gen11 servers
• 5600MHz (PC5-44800) — ~17% higher bandwidth than DDR5-4800 for memory-intensive workloads
• CL46 latency at DDR5-5600 for high-speed high-capacity Gen11 server memory
• On-die ECC plus registered buffer for enhanced dual-layer DDR5 reliability
• 1.1V low-voltage operation at DDR5-5600 maximum density

Product Specifications

• Part Number: P71561-001
• Manufacturer: HP / HPE
• Capacity: 128GB
• Type: DDR5 ECC Registered DIMM (RDIMM)
• Speed: 5600MHz (PC5-44800)
• CAS Latency: CL46
• 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: PC5-44800 (DDR5-5600)

Performance Specifications

• Bandwidth: Up to 44,800 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 DDR5-5600 RDIMM for HPE ProLiant Gen11 servers with 5600MHz DDR5 support
• Highest-bandwidth 128GB DDR5 RDIMM for AI inference, SAP HANA, and HPC on Gen11
• Memory-bandwidth-sensitive workloads requiring maximum DDR5 throughput at 128GB density
• OEM (-001) variant for server-integrated procurement of 128GB DDR5-5600 on Gen11

Compatibility

• HPE ProLiant Gen11 servers with DDR5-5600 support — verify processor and platform support
• Intel Xeon Scalable 5th Gen (Emerald Rapids) provides native DDR5-5600 support
• May operate at DDR5-4800 in servers with 4th Gen Sapphire Rapids processors
• Not compatible with DDR4 DIMM slots — DDR5 uses incompatible 288-pin keying

Frequently Asked Questions

What is the difference between P71561-001 (DDR5-5600) and P71560-001 (DDR5-4800) at 128GB?

Both are 128GB DDR5 ECC 2Rx4 RDIMMs for HPE Gen11 servers, but differ in speed — P71561-001 operates at DDR5-5600 (44,800 MB/s) while P71560-001 operates at DDR5-4800 (38,400 MB/s), approximately 17% more bandwidth for the 5600MHz variant. DDR5-5600 requires a processor and platform that natively supports that speed; in servers limited to DDR5-4800, the P71561-001 will operate at DDR5-4800.

What is the difference between P71561-001 and P69976-B21?

Both are 128GB DDR5-5600 ECC 2Rx4 CL46 RDIMMs at 1.1V for HPE ProLiant Gen11. P71561-001 is the HPE factory/OEM (-001) variant, while P69976-B21 is the standard HPE option kit (-B21) for channel ordering. Both are functionally identical and interchangeable in supported HPE Gen11 servers.

Does DDR5-5600 provide meaningful performance improvement over DDR5-4800 for server workloads?

For memory-bandwidth-sensitive workloads — AI/ML inference, HPC simulations, large matrix operations, and streaming analytics — DDR5-5600”s ~17% bandwidth increase over DDR5-4800 provides measurable throughput improvement. For latency-sensitive workloads (OLTP, key-value stores), the CAS latency difference is more important than raw bandwidth; both DDR5 speeds offer similar latency profiles.

The HPE P71561-001 delivers 128GB DDR5-5600 ECC RDIMM capacity in a 2Rx4 configuration — providing the highest standard DDR5 bandwidth at 128GB density for HPE ProLiant Gen11 servers requiring maximum memory throughput for AI inference, SAP HANA, HPC, and memory-bandwidth-intensive enterprise workloads at next-generation DDR5-5600 performance levels.