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 circuit board with gold edge connectors and black memory chips, no heat spreader

OWC

OWC 64GB DDR4 2666 ECC Registered DIMM 4Rx4 CL19 1.2V 288-pin Fujitsu PRIMERGY RX4770 M4 memory upgrade

SKU CH-XC0F-FQ6D5

64 GB DDR4 ECC registered DIMM running at 2666 MHz CL19 for Fujitsu PRIMERGY servers

  • Capacity64GB
  • Type288-Pin DDR4 ECC RDIMM
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Voltage1.2V
  • ECCYes

Capacity 64GB

  • 64 GB capacity lets you run larger workloads in Fujitsu PRIMERGY servers
  • ECC registered design detects and corrects data errors for reliable operation
  • DDR4 2666 CL19 at 1.2 V balances speed and power efficiency
  • Single 4Rx4 288-pin module simplifies installation in compatible PRIMERGY models
  • Backward compatible with 2133 MHz and 2400 MHz systems for flexible deployment

Targeted Server Upgrade

This 64GB DDR4 2666 ECC Registered DIMM is built for Fujitsu PRIMERGY RX4770 M4, CX2560 M4, CX2570 M4, RX2530 M4 and RX2540 M4 systems. It serves administrators who need to expand memory capacity in compatible rack and blade servers. The module will not work in standard desktop computers or with unbuffered or load-reduced memory types.

Build Integration

The 288-pin RDIMM plugs directly into registered DIMM slots on the supported PRIMERGY platforms. It replaces Fujitsu part numbers S26361F4026L764, S26361-F4026-L364, S26361F4026E764, S26361-F4026-E364 and S26361F4026E364. Because it is registered ECC memory, it cannot be mixed with unbuffered or load-reduced modules in the same system.

Thermals and Power

Operating at 1.2V, the module runs at standard DDR4 voltage without a heat spreader. It is backward compatible with 2133MHz and 2400MHz bus speeds, allowing deployment in systems configured for lower frequencies. The registered buffer and ECC functionality add minimal latency while providing error correction for continuous server workloads.

Highlights

  • 64 GB capacity lets you run larger workloads in Fujitsu PRIMERGY servers
  • ECC registered design detects and corrects data errors for reliable operation
  • DDR4 2666 CL19 at 1.2 V balances speed and power efficiency
  • Single 4Rx4 288-pin module simplifies installation in compatible PRIMERGY models
  • Backward compatible with 2133 MHz and 2400 MHz systems for flexible deployment

Specifications

BrandOWC
Part Number2R6D44R464GB
Capacity64GB
Type288-Pin DDR4 ECC RDIMM
SpeedDDR4 2666 (PC4 21300)
CAS LatencyCL19
Voltage1.2V
ECCYes
Buffered/RegisteredRegistered
Rank4Rx4
Heat SpreaderNo
Compatible SystemFujitsu PRIMERGY RX4770 M4
Fujitsu PRIMERGY CX2560 M4
Fujitsu PRIMERGY CX2570 M4
Fujitsu PRIMERGY RX2530 M4
Fujitsu PRIMERGY RX2540 M4

Other versions of this model

5 more in the same range

Same family, different memory, cooler or clock — compare before you commit.

Questions about this item

Will the 4Rx4 rank and CL19 latency limit throughput when the Fujitsu PRIMERGY RX4770 M4 runs sustained workloads?

The module is a 4Rx4 registered ECC DIMM with CL19 timing at 2666 MT/s. Rank density and latency are fixed by the JEDEC DDR4 specification for this speed grade; the server’s memory controller schedules accesses within those parameters.

How much heat and power does a single 64 GB 1.2 V registered DIMM add when the RX4770 M4 runs all day?

Each DIMM operates at 1.2 V without a heat spreader. Power draw follows the DDR4 2666 registered specification; the server’s existing airflow and cooling design handle the thermal load for the supported memory population.

Which Fujitsu part numbers must the RX4770 M4 already use for this OWC 2R6D44R464GB module to be a direct replacement?

This module replaces Fujitsu part numbers S26361F4026L764, S26361-F4026-L364, S26361F4026E764, S26361-F4026-E364 and S26361F4026E364.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.