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Green circuit board with black memory chips, no heat spreader, 288-pin DDR5 RDIMM module

OWC

OWC 64GB DDR5 5600 CL46 2Rx4 288-pin ECC Registered RDIMM memory upgrade

SKU CH-B77Z-DRB9A

64 GB DDR5-5600 ECC registered RDIMM for Supermicro SuperServer SYS-611C-TN4R, SYS-621BT-DNC8R, SYS-621BT-DNTR, SYS-621BT-HNC8R and SYS-621BT-HNTR

  • Total capacity64 GB
  • Rated speedDDR5 5600 (PC5 44800)
  • CAS latency46
  • Rated voltage1.1 V
  • Buffer typeRegistered
  • Memory rank2Rx4

Capacity 64GB

  • 64 GB capacity lets you run larger workloads on supported Supermicro servers
  • DDR5 5600 speed with CL46 latency delivers high-throughput data handling
  • ECC registered design detects and corrects errors for reliable server operation
  • 1 V operating voltage reduces power draw in dense memory configurations
  • Validated for SYS-611C-TN4R and SYS-621BT series for warranty-safe upgrades

Server memory upgrade

This 64 GB DDR5 5600 module is an ECC registered RDIMM built for specific Supermicro SuperServer platforms. It targets administrators who need to expand memory capacity in the SYS-611C-TN4R or SYS-621BT series. The single stick operates at 1.1 V with a CL46 latency and a 2Rx4 rank configuration. No heat spreader is included.

Workstation and server builders

The module suits users upgrading compatible Supermicro servers that require registered ECC memory. It will not work in standard desktop computers or consumer motherboards. Buyers who need unbuffered or load-reduced DIMMs must select a different memory type. Mixing this registered stick with incompatible memory types is not supported.

DDR5 5600 registered ECC

The decisive specification is the DDR5 5600 registered ECC RDIMM form factor with CL46 timing. Only systems qualified for this exact registered ECC standard can use the module. Verifying the server model against the supported list is essential before purchase. The 288-pin design fits only DDR5 registered slots.

How it compares

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

Price $1,623.99
Pricier than about 65% 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).
CAS latency 46
Higher than about 90% of the 483 comparable items (median 22).
Price per GB $25.37 per GB
Pricier than about 70% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number5R6D52R464 GB
Total capacity64 GB
Product type288-Pin DDR5 ECC RDIMM
Performance
Rated speedDDR5 5600 (PC5 44800)
Memory
CAS latency46
ECC supportYes
Buffer typeRegistered
Memory rank2Rx4
Heat spreaderNo
Power
Rated voltage1.1 V
Compatibility
Compatible systemsSupermicro SuperServer SYS-611C-TN4R
Supermicro SuperServer SYS-621BT-DNC8R
Supermicro SuperServer SYS-621BT-DNTR
Supermicro SuperServer SYS-621BT-HNC8R
Supermicro SuperServer SYS-621BT-HNTR

Other versions of this model

5 more in the same range

Questions about this item

Is this a single 64GB module or a kit of multiple sticks?

It is a single 64GB DDR5 5600 CL46 2Rx4 288-pin ECC Registered RDIMM module.

What real-world bandwidth does the PC5-44800 rating deliver?

The PC5-44800 rating corresponds to a peak transfer rate of 44800 MB/s at 5600 MT/s.

Will this registered ECC DDR5 work in a standard desktop motherboard?

No, registered ECC DDR5 RDIMMs require a workstation or server platform that supports registered memory; they are not compatible with standard desktop boards.

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