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Green printed circuit board with black memory chips and gold edge connector

OWC

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

SKU CH-MB76-89C8Z

A 128GB DDR4 2933 ECC registered RDIMM for Lenovo ThinkAgile VX5520, VX7320-N, VX7520, VX3520-G and VX3720 servers

  • Total capacity128 GB
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latency21
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank8Rx4
  • 128 GB capacity expands server memory headroom for heavy workloads
  • DDR4 2933 speed with CL21 latency delivers responsive data throughput
  • ECC registered design detects and corrects single-bit errors automatically
  • 2 V operation reduces power draw in dense configurations
  • Validated for Lenovo ThinkAgile VX5520 VX7320-N VX7520 VX3520-G VX3720

Server Memory Upgrade

This 128GB DDR4 ECC Registered RDIMM is built for Lenovo ThinkAgile VX servers running Xeon SP Gen 2 processors. It targets administrators who need to expand memory capacity in VX5520, VX7320-N, VX7520, VX3520-G or VX3720 systems. The module is not suitable for standard desktop computers or workstations that require unbuffered or load-reduced DIMMs. Mixing it with those memory types will prevent the system from booting.

Registered ECC Architecture

The single decisive specification is the 8Rx4 Registered ECC design operating at 1.2V. This registration buffers address and command signals, allowing the memory controller to support the high density of a 128GB module. Systems that expect unbuffered or load-reduced memory cannot use this DIMM, and the motherboard must explicitly support Registered ECC DDR4 for the upgrade to function.

Sustained Workload Stability

Under continuous load the module maintains JEDEC-standard DDR4 2933 operation with CL21 latency. Error-correcting code detects and corrects single-bit errors in real time, preventing data corruption during long-running virtualisation or database tasks. The 1.2V voltage keeps power draw consistent across populated channels, and backward compatibility with 2133, 2400 and 2666MHz buses allows the DIMM to run stably if the platform downclocks for thermal or configuration reasons.

How it compares

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

Price $759.99
Pricier than about 57% 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 $5.94 per GB
Cheaper than about 66% of the 20,941 comparable items (median $8.19 per GB).

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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

Questions about this item

What does the 2933 MT/s speed mean once the module is installed in a ThinkAgile VX5520?

The module runs at DDR4 2933 (PC4-23400) with CL21 latency, delivering the rated throughput when the platform memory controller is configured for that speed.

How does the DDR4 288-pin ECC Registered interface affect compatibility with the ThinkAgile VX7320-N?

The 288-pin DDR4 ECC Registered form factor fits the server DIMM slots; it cannot be mixed with unbuffered or load-reduced modules and requires a platform that supports registered ECC memory.

What physical slot and clearance does the 128GB 8Rx4 RDIMM need in a ThinkAgile VX7520?

It occupies a single 288-pin DDR4 DIMM slot, has no heat spreader, and operates at 1.2 V, so standard server DIMM clearance applies.

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