We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Green rectangular DDR4 memory module with gold edge connectors and black chips, no heat spreader

NEMIX RAM

NEMIX RAM 64GB DDR4 2666MHz CL19 4Rx4 ECC RDIMM memory upgrade

SKU CH-SET5-E4ZVE

Adds 64 GB of DDR4 2666 ECC registered memory with CL19 timing for Lenovo servers

  • Total capacity64 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeRegistered
  • Rated voltage1.2 V
  • 64GB capacity expands server memory for heavy workloads
  • DDR4 2666MHz speed delivers high data throughput
  • CL19 latency supports responsive registered operation
  • ECC registered design protects data integrity in critical systems
  • 2V voltage enables efficient 288-pin RDIMM performance

Lenovo-compatible 64 GB DDR4 ECC RDIMM

This registered DDR4 module delivers 64 GB of error-correcting memory for Lenovo servers and workstations. It operates at 2666 MHz with a CL19 latency and runs on 1.2 V. The 288-pin RDIMM form factor fits compatible Lenovo platforms that require registered ECC memory.

Sustained load behaviour with 4Rx4 organisation

The 4Rx4 rank configuration spreads memory accesses across four ranks of x4 chips, helping to maintain throughput during prolonged workloads. Registered buffering reduces electrical load on the memory controller, supporting stable operation in multi-module server configurations. ECC circuitry detects and corrects single-bit errors throughout continuous operation.

Single specification that decides fit: 4Rx4

This module uses a 4Rx4 organisation and registered ECC signalling that must match the platform's memory controller requirements. Systems expecting a different rank structure, unbuffered DIMMs or non-ECC memory will not support this part. Verify the server or workstation documentation for 4Rx4 RDIMM compatibility before purchase.

How it compares

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

Price $265.99
Cheaper than about 56% of the 21,161 comparable items (median $397.99).
Total capacity 64 GB
Higher than about 60% of the 20,941 comparable items (median 32 GB).
Price per GB $4.16 per GB
Cheaper than about 83% of the 20,941 comparable items (median $8.19 per GB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameNEMIX RAM
Product lineLenovo Server/Workstation Compatible Series Memory
Model nameLenovo DDR4 2666 MHz ECC RDIMM Registered Server Memory
Part numberMR21300-944K1
Total capacity64 GB
Product type288-Pin DDR4 RDIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL19
ECC supportYes
Buffer typeRegistered
Heat spreaderNo
Memory rank4Rx4
Power
Rated voltage1.2 V
Compatibility
Compatible systemsLenovo
In the box
Included items64 GB (1 × 64 GB) DDR4 2666 MHz PC4-21300 4Rx4 1.2 V CL19 288-PIN ECC RDIMM Registered Server Memory

Questions about this item

How much power does the 1.2V DDR4 2666 module draw when the server runs continuously?

The module operates at 1.20V, the standard DDR4 voltage, so power draw stays within normal registered DIMM limits for 2666 MT/s operation.

What motherboard slot and chipset support are required to install this 288-pin RDIMM?

A server or workstation motherboard with DDR4 RDIMM slots, registered memory support, and ECC capability is needed; the module is validated for Lenovo systems using part number 4X77A78614.

Will this 4Rx4 ECC RDIMM work alongside existing 2Rx4 or 1Rx4 sticks in the same Lenovo server?

Mixing ranks is platform-dependent; the memory controller must support 4Rx4 population rules, so consult the system manual before adding this module to channels with different rank configurations.

More in Model-Specific Memory Upgrades

Similar items