HPE P53624-0A1 16GB DDR5-5600 ECC RDIMM — 1Rx8 Server Memory

The HPE P53624-0A1 is a 16GB DDR5-5600 ECC Registered DIMM providing single-rank x8 server memory for HPE ProLiant Gen11 servers — delivering CL46 latency at 5600MHz (PC5-44800) with 1.1V operation and on-die ECC. The HPE Smart Buy (-0A1) variant of P64705-B21, providing 16GB DDR5-5600 RDIMM capacity for HPE Gen11 platforms at the highest standard DDR5 speed.

Key Features

• 16GB DDR5-5600 ECC RDIMM — 1Rx8 single-rank at the highest standard DDR5 speed
• 5600MHz (PC5-44800) — higher bandwidth than DDR5-4800 for memory-intensive Gen11 workloads
• CL46 latency at DDR5-5600 with on-die ECC for dual-layer DDR5 reliability
• HPE Smart Buy (-0A1) variant of P64705-B21 for qualified program procurement
• 1.1V low-voltage DDR5 for energy-efficient server memory at DDR5-5600 speed

Product Specifications

• Part Number: P53624-0A1
• Manufacturer: HP / HPE
• Capacity: 16GB
• Type: DDR5 ECC Registered DIMM (RDIMM)
• Speed: 5600MHz (PC5-44800)
• CAS Latency: CL46
• Voltage: 1.1V
• Ranks x Width: 1Rx8
• 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

• HPE Smart Buy procurement of 16GB DDR5-5600 RDIMM for Gen11 server configurations
• Entry-capacity DDR5-5600 RDIMM for HPE ProLiant Gen11 platforms supporting DDR5-5600
• Highest-bandwidth 16GB DDR5 RDIMM for memory-intensive Gen11 workloads per slot
• Interchangeable with P64705-B21 in supported HPE ProLiant Gen11 servers

Compatibility

• HPE ProLiant Gen11 servers with DDR5-5600 support (Intel Xeon Scalable 5th Gen Emerald Rapids)
• May operate at DDR5-4800 in Gen11 servers with Sapphire Rapids 4th Gen processors
• Not compatible with DDR4 DIMM slots — DDR5 uses incompatible 288-pin keying
• Verify HPE Gen11 QuickSpecs for DDR5-5600 RDIMM per-slot support before ordering

Frequently Asked Questions

What is the difference between P53624-0A1 and P64705-B21?

Both are 16GB DDR5-5600 ECC 1Rx8 CL46 RDIMMs at 1.1V for HPE ProLiant Gen11 — functionally identical. P53624-0A1 is the HPE Smart Buy (-0A1) variant, while P64705-B21 is the standard HPE option kit (-B21). Both are fully interchangeable in supported HPE Gen11 servers.

What is the advantage of DDR5-5600 over DDR5-4800 at 16GB RDIMM?

DDR5-5600 provides approximately 17% higher theoretical bandwidth than DDR5-4800 — 44,800 MB/s vs. 38,400 MB/s per channel. For memory-bandwidth-sensitive workloads like AI inference, HPC, and streaming analytics, this improvement is meaningful. DDR5-5600 requires a server platform with 5th Gen Intel Xeon (Emerald Rapids) for native support; on Sapphire Rapids Gen11 servers, the module will operate at DDR5-4800.

Is 16GB DDR5-5600 RDIMM suitable for high-density Gen11 server configurations?

16GB per slot is suitable for standard-density Gen11 configurations where cost-per-GB is important and per-slot capacity requirements are moderate. For higher-density configurations requiring 32GB, 64GB, or 128GB per slot, HPE offers larger DDR5-5600 and DDR5-4800 RDIMMs. The 1Rx8 configuration also provides slightly lower latency than 2Rx8 at equivalent capacity due to simpler rank structure.

The HPE P53624-0A1 delivers 16GB DDR5-5600 ECC RDIMM capacity in a 1Rx8 single-rank configuration as the Smart Buy procurement variant of P64705-B21 — providing the highest standard DDR5 bandwidth at 16GB density for HPE ProLiant Gen11 servers, combining on-die ECC dual-layer protection with 1.1V DDR5-5600 efficiency for Gen11 memory-intensive workloads.