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Green printed circuit board with black memory chips and gold edge connectors

HPE

HPE P64985-B21 32GB DDR5 5600 CL46 RDIMM server RAM

SKU CH-G5DK-REY5S MPN P64985-B21

32 GB DDR5 5600 registered ECC RDIMM at 1.1 V with CL46 timing for server workloads

  • Total capacity32 GB
  • Rated speedDDR5 5600 (PC5 44800)
  • CAS latencyCL46
  • Memory timings46-45-45
  • Rated voltage1.1 V
  • Buffer typeRegistered
  • 32 GB capacity supports memory-intensive server workloads
  • DDR5 5600 MT/s speed delivers high data throughput
  • Registered ECC design protects data integrity under load
  • CL46 CAS latency with 46-45-45 timing optimises response
  • 1 V operation reduces power draw per module

HPE SmartMemory 32GB DDR5 RDIMM

This HPE SmartMemory module provides 32GB of DDR5 registered ECC memory for server platforms. It operates at 5600 MHz with a CAS latency of CL46 and a voltage of 1.10V. The 288-pin RDIMM form factor is designed for multi-socket systems requiring data integrity and high density.

Suited for registered ECC DDR5 slots only

This module fits servers that accept registered DDR5 RDIMMs with ECC enabled. It will not work in desktop motherboards that require unbuffered non-ECC memory. Buyers needing unbuffered DIMMs or a different capacity should look at other products.

Straightforward DIMM installation

Align the notch on the 288-pin edge connector with the slot key and press firmly until the retention clips engage. Ensure the server BIOS is current for DDR5 5600 support. A common issue is mixing registered and unbuffered modules, which prevents the system from posting.

How it compares

Measured against everything we stock in ECC Server RAM, at today’s prices. Recalculated every night.

Price $787.99
Pricier than about 77% of the 6,523 comparable items (median $188.99).
Total capacity 32 GB
Typical for this category: the median of 6,064 items is 32 GB.
Price per GB $24.62 per GB
Pricier than about 86% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameHPE
Product lineSmartMemory
Model nameP64985-B21
Part numberP64985-B21
Total capacity32 GB
Product type288-Pin DDR5 RDIMM
Performance
Rated speedDDR5 5600 (PC5 44800)
Memory
CAS latencyCL46
Memory timings46-45-45
ECC supportYes
Buffer typeRegistered
Power
Rated voltage1.1 V
Size & build
Shipping weight0.05 kg
Package size152 × 51 × 3 mm

Questions about this item

Does my server need 288-pin DDR5 RDIMM slots to use this 32 GB module?

Yes, the module is a 288-pin DDR5 RDIMM and requires a compatible DDR5 RDIMM slot.

Will this CL46 5600 MHz module downclock to match slower DDR5 RDIMMs already installed?

Yes, it will run at the lowest common speed and timing across all populated DDR5 RDIMM slots.

How do I verify the module is running at 5600 MHz with CL46 timings after installation?

Check the memory speed and latency in the server BIOS or with a tool such as dmidecode or CPU-Z.

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