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Green rectangular circuit board with gold edge connector and black memory chips

A-Tech

A-Tech 32GB DDR3L 1600 ECC LRDIMM 4Rx4 HP 647904-B21 684590-001 A2Z53AA Server Memory

SKU CH-XN19-71Y1Q

32 GB DDR3L 1600 ECC LRDIMM module matching HP 647904-B21 684590-001 A2Z53AA at PC3L-12800 with 4Rx4 organisation

  • Total capacity32 GB
  • Rated speedDDR3L 1600 (PC3L 12800)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL11
  • Rated voltage1.35 V
  • Buffer typeLoad Reduced
  • 32GB capacity expands server memory headroom for heavy workloads
  • DDR3L 1600 speed at 1.35V cuts power draw versus standard DDR3
  • ECC LRDIMM with 4Rx4 rank corrects errors and reduces electrical load on the bus
  • 240-pin DIMM form factor fits HP part numbers 647904-B21 684590-001 A2Z53AA
  • CL11 latency and major-brand chips deliver tested reliability for continuous operation

32 GB DDR3L LRDIMM for HP Servers

This 32 GB DDR3L 1600 MHz module uses ECC Load Reduced technology to support high-capacity server configurations. It replaces HP part numbers 647904-B21, 684590-001 and A2Z53AA in compatible workstation and server systems. The 4Rx4 organisation and 1.35 V low-voltage operation suit dense memory deployments.

240-pin DIMM installs in standard DDR3 slots

Align the notch on the 240-pin module with the slot key and press firmly until the retention clips engage. The load-reduced buffer reduces electrical loading on the memory controller, so the module works in populated multi-DIMM configurations where standard registered DIMMs may not. Verify the system BIOS supports LRDIMM before installation.

ECC LRDIMM 4Rx4 at 1.35 V decides compatibility

Only systems that explicitly support DDR3L ECC Load Reduced DIMMs with 4Rx4 ranking can use this module. Standard DDR3 ECC RDIMM or UDIMM slots will not operate correctly with this part. Check the platform qualified-vendor list for the exact HP part numbers above before purchase.

How it compares

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

Price $53.99
Cheaper than about 83% 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 $1.69 per GB
Cheaper than about 95% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameA-Tech
Total capacity32 GB
Performance
Rated speedDDR3L 1600 (PC3L 12800)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL11
ECC supportYes
Buffer typeLoad Reduced
Memory rank4Rx4
Power
Rated voltage1.35 V

Questions about this item

How do I confirm the 32GB DDR3L 1600 LRDIMM is running at PC3L-12800 CL11 after installation?

Enter the BIOS or UEFI and check that the memory speed reads 1600 MHz, voltage shows 1.35 V, and CAS latency is CL11. The ECC LRDIMM label on the module also verifies the correct part.

What comes in the box and what must I source separately for the HP 647904-B21 replacement?

The package contains one 32 GB 240-pin DDR3L ECC LRDIMM module. No cables, brackets or additional DIMMs are included; buy extra modules separately if your server needs more capacity.

Should I choose the 32GB 4Rx4 LRDIMM or a different rank for my HP ProLiant using part 647904-B21?

Select this 32 GB 4Rx4 Load Reduced DIMM when the service manual specifies 647904-B21, 684590-001 or A2Z53AA; other ranks or non-LRDIMM types will not match the required specification.

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