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OWC

OWC 128GB DDR4 2933 ECC Registered RDIMM CL21 8Rx4 1.2V ThinkStation P920 memory upgrade

SKU CH-JNH7-0XZ5Z

128GB DDR4 2933 ECC Registered RDIMM module upgrades Lenovo ThinkStation P920 and compatible ThinkAgile servers

  • Total capacity128 GB
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latency21
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank8Rx4
  • 128 GB single module doubles workstation capacity
  • ECC registered design prevents data corruption in critical workloads
  • 2933 MHz DDR4 speed with CL21 latency
  • 2 V operation reduces power draw and heat
  • Validated for ThinkStation P920 and ThinkAgile VX series

128GB DDR4 ECC RDIMM for ThinkStation P920

This 128GB DDR4 2933 ECC Registered RDIMM is built for the Lenovo ThinkStation P920 and compatible ThinkAgile VX models. It delivers 288-pin DDR4 memory with CL21 latency and 8Rx4 organisation at 1.2V. The module suits workstations and servers that require registered ECC memory for data integrity. It will not work in standard desktop computers or alongside unbuffered or load-reduced DIMMs.

JEDEC-standard thermals and 1.2V operation

The module follows JEDEC DDR4 specifications and runs at the standard 1.2V, keeping power draw low during typical workloads. Without a heat spreader it relies on system airflow, which is sufficient for normal server and workstation duty cycles. Backward compatibility with 2133MHz, 2400MHz and 2666MHz platforms allows the same module to run cooler at reduced speeds when installed in older slots.

Stable throughput under sustained load

Registered ECC architecture adds a clock cycle of buffering, which steadies the command bus during long compute runs on Xeon-based ThinkStation and ThinkAgile systems. The single 128GB rank configuration populates one slot at full capacity, leaving remaining channels free for further expansion. Error correction operates continuously, correcting single-bit errors without interrupting extended rendering, virtualisation or database tasks.

How it compares

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

Price $729.99
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 $5.70 per GB
Cheaper than about 68% 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

Questions about this item

How do I install the 288-pin DDR4 2933 RDIMM into the ThinkStation P920, and what is the common mistake?

Power off the workstation, open the case, align the single notch on the 288-pin module with the slot key, press firmly until both retention clips click. The step often missed is seating the module fully so both clips engage; a partial insert causes boot failure.

What maintenance or replacement will this 128GB 8Rx4 ECC registered module need over its service life?

No scheduled maintenance is required. The module has no heat spreader and runs at 1.2V, so keep system airflow clear of dust. Replacement is only needed if a memory error appears or capacity must be increased beyond 128GB.

What limit appears first when this CL21 2933MHz registered memory runs sustained workloads on Xeon platforms?

The registered buffer adds one cycle of latency, so memory-controller throughput saturates before the DRAM chips reach thermal limits. The practical ceiling is the 2933 MT/s data rate combined with CL21 timing under continuous load.

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