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

OWC

OWC 128GB DDR4 2933 ECC Registered RDIMM 288-pin CL21 1.2V 8Rx4 memory upgrade

SKU CH-ZC86-VBQHS

A 128GB DDR4 2933 ECC registered RDIMM for Cisco UCS B200 M5, B480 M5, C220 M5, C240 M5 and C480 M5 servers

  • Total capacity128 GB
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latency21
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank8Rx4
  • 128 GB single-module capacity fits dense server configurations
  • ECC registered design detects and corrects data errors for reliability
  • DDR4 2933 MHz CL21 speed supports high-throughput workloads
  • 2 V operation reduces power draw in multi-DIMM deployments
  • Compatible with Cisco UCS B200 M5, B480 M5, C220 M5, C240 M5, C480 M5

Target Platform & Purpose

This 128GB DDR4 2933 ECC Registered RDIMM is built for Cisco UCS B200 M5, B480 M5, C220 M5, C240 M5 and C480 M5 servers. It suits administrators who need high-capacity registered memory with error correction for virtualisation, databases or heavy compute workloads. It will not work in standard desktop computers or consumer motherboards. Buyers who need unbuffered or load-reduced DIMMs should look elsewhere.

Pre-Installation Checks

Verify that your Cisco UCS model appears in the supported list above and that the system BIOS is current. The module runs at 1.2V with CL21 latency and an 8Rx4 organisation; mixing it with unbuffered or load-reduced memory is not supported. Confirm the server has free 288-pin DDR4 slots and that the total installed capacity does not exceed the platform limit.

Sustained-Load Behaviour

JEDEC-standard construction and ECC registration keep data integrity intact during continuous operation at 2933 MT/s. The module is also backward compatible with 2133, 2400 and 2666 MT/s bus speeds, allowing stable performance when the platform downclocks memory under heavy thermal or power constraints. No heat spreader is fitted, so adequate chassis airflow is required for long-duration workloads.

How it compares

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

Price $701.99
Pricier than about 56% 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 21
Lower than about 63% of the 483 comparable items (median 22).
Price per GB $5.48 per GB
Cheaper than about 70% 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 nameOWC
Part number2R9D48R4128G
Total capacity128 GB
Product type288-Pin DDR4 ECC RDIMM
Performance
Rated speedDDR4 2933 (PC4 23400)
Memory
CAS latency21
ECC supportYes
Buffer typeRegistered
Memory rank8Rx4
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsCisco UCS B200 M5
Cisco UCS B480 M5
Cisco UCS C220 M5
Cisco UCS C240 M5
Cisco UCS C480 M5

Questions about this item

What comes with the single 128GB DDR4 2933 ECC Registered RDIMM and is anything else required?

The box contains one 128GB 288-pin module; no cables, brackets or additional parts are needed for installation in a compatible Cisco UCS server.

Should I choose this 128GB 8Rx4 CL21 module or a different capacity for my Cisco UCS B200 M5?

This is a single 128GB 8Rx4 CL21 stick; select it when you need maximum density per slot, otherwise pick lower-capacity RDIMMs to match your channel population plan.

What does the 2933 MT/s rating actually deliver once the module is seated in a Cisco UCS C240 M5?

The module runs at 2933 MT/s CL21 at 1.2 V and will down-clock to 2666, 2400 or 2133 MT/s if the platform requires a lower speed.

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