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Two green DDR5 RDIMM sticks with black chips, no heat spreaders

NEMIX RAM

NEMIX RAM 64GB (2x32GB) DDR5 5600 CL46 1Rx4 ECC RDIMM SR685a V3 memory upgrade

SKU CH-NWCZ-M727W

DDR5 5600 ECC registered 64GB kit (2x32GB) validated for Lenovo ThinkSystem SR685a V3 servers

  • Total capacity64 GB (2 × 32 GB)
  • Rated speedDDR5 5600 (PC5 44800)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL46
  • Buffer typeRegistered
  • Rated voltage1.1 V
  • 64 GB total capacity from two 32 GB modules
  • DDR5 5600 speed rated at PC5-44800
  • ECC registered design protects data integrity
  • 1Rx4 single-rank layout for server stability
  • 10 V operation at CL46 latency

Lenovo SR685a V3 memory kit

This 64GB kit contains two 32GB DDR5 RDIMM modules built for the Lenovo ThinkSystem SR685a V3 rack server. It delivers registered ECC memory for workloads that require error correction and signal integrity in a server environment.

Registered ECC with 1Rx4 organisation

Each module is a 288-pin DDR5 RDIMM running at 5600 MT/s with CL46 latency and 1.1V operation. The 1Rx4 rank layout and registered buffer match the platform's qualified memory configuration for stable operation.

Sustained load behaviour

Modules are stress tested under load to verify reliability during continuous server duties. Registered buffering and ECC maintain data integrity across extended compute cycles without the signal degradation seen in unbuffered designs.

How it compares

Measured against everything we stock in Model-Specific Memory Upgrades, at today’s prices. Recalculated every night.

Price $2,039.99
Pricier than about 69% of the 21,161 comparable items (median $397.99).
Total capacity 64 GB (2 × 32 GB)
Higher than about 60% of the 20,941 comparable items (median 32 GB).
Price per GB $31.87 per GB
Pricier than about 90% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameNEMIX RAM
Product lineLenovo Server/Workstation Compatible Series Memory
Model nameLenovo DDR5 5600 MHz ECC RDIMM Registered Server Memory
Part numberMR44800-314K2
Total capacity64 GB (2 × 32 GB)
Product type288-Pin DDR5 RDIMM
Performance
Rated speedDDR5 5600 (PC5 44800)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL46
ECC supportYes
Buffer typeRegistered
Heat spreaderNo
Memory rank1Rx4
Power
Rated voltage1.1 V
Compatibility
Compatible systemsLenovo
In the box
Included items64 GB (2 × 32 GB) DDR5 5600 MHz PC5-44800 1Rx4 1.1 V CL46 288-PIN ECC RDIMM Registered Server Memory KIT

Questions about this item

What does the 5600 MT/s rating mean once the kit is installed in a ThinkSystem SR685a V3?

The modules run at 5600 MT/s (PC5-44800) with CL46 latency, giving the server its rated DDR5 bandwidth when populated per Lenovo's memory-configuration rules.

How does the 288-pin RDIMM interface and registered design affect what the memory controller can do?

The 288-pin DDR5 RDIMM presents a registered signal to the controller, allowing higher capacities per channel while the on-module register adds one cycle of latency.

What physical clearance does the 1Rx4 32 GB module need inside the SR685a V3 chassis?

Each stick is a standard-height 288-pin RDIMM without a heat spreader, so it fits the server's DIMM slots without extra clearance beyond the normal latch space.

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