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Green rectangular DDR5 memory module with gold contacts and black chips, no heat spreader

OWC

OWC 5R6D54R4128G 128GB DDR5 5600 CL46 4Rx4 ECC RDIMM memory upgrade

SKU CH-BF5D-XKXJ2

128 GB DDR5 5600 CL46 ECC registered RDIMM for Supermicro SuperServer 611 and 621 series

  • Total capacity128 GB
  • Rated speedDDR5 5600 (PC5 44800)
  • CAS latency46
  • Rated voltage1.1 V
  • Buffer typeRegistered
  • Memory rank4Rx4

Capacity 128GB

  • 128GB capacity expands server memory headroom for virtualization workloads
  • DDR5 5600 speed delivers high throughput for data-intensive applications
  • ECC registered design detects and corrects single-bit errors automatically
  • 1V operation reduces power draw per module in dense configurations
  • Validated for Supermicro SuperServer SYS-611C-TN4R and four SYS-621BT models

System-specific server memory

This OWC module delivers 128GB of DDR5 ECC registered memory in a single 288-pin RDIMM. It is built for Supermicro SuperServer platforms including the SYS-611C-TN4R and several SYS-621BT models. The registered design adds a buffer that stabilises heavy multi-DIMM configurations. Workstations and standard desktops cannot use this module.

JEDEC-standard registered build

The stick runs at 5600 MT/s with a CAS latency of 46 and operates at 1.1V. It carries a 4Rx4 organisation and has no heat spreader, so it fits tight server DIMM slots without clearance issues. ECC circuitry corrects single-bit errors on the fly. Mixing this registered DIMM with unbuffered or load-reduced modules is not supported.

Capacity jump for dense workloads

A single 128GB RDIMM lets you reach high memory totals using fewer slots, which is useful when upgrading older SuperServer units or populating a new build economically. The jump is worth it when your applications demand more addressable memory than smaller RDIMMs can provide. Buyers who need unbuffered ECC or consumer DDR5 should look elsewhere.

How it compares

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

Price $3,431.99
Pricier than about 74% of the 21,161 comparable items (median $397.99).
Total capacity 128 GB
Higher than about 70% 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 $26.81 per GB
Pricier than about 74% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number5R6D54R4128G
Total capacity128 GB
Product type288-Pin DDR5 ECC RDIMM
Performance
Rated speedDDR5 5600 (PC5 44800)
Memory
CAS latency46
ECC supportYes
Buffer typeRegistered
Memory rank4Rx4
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

What DDR5 speed and CAS latency does this module run at?

It operates at DDR5 5600 with a CAS latency of 46, matching the PC5-44800 JEDEC standard.

Which physical slot and pin count does this 288-pin RDIMM require?

It fits a standard 288-pin DDR5 DIMM slot in the listed Supermicro SuperServer models.

How is this ECC registered module installed, and what common mistake should be avoided?

Align the notch with the slot key, press firmly until the latches click, and do not mix it with unbuffered or load-reduced DIMMs.

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