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Green 288-pin DDR4 ECC registered DIMM module with black chips

OWC

OWC 128GB DDR4 2933MHz CL21 ECC Registered 288pin DIMM memory upgrade

SKU CH-S15F-VDK00

128GB DDR4 2933MHz ECC registered DIMM for Supermicro X11 server motherboards

  • Total capacity128 GB
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latencyCL21
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank4Rx4

Capacity 128GB

  • 128GB capacity expands server memory headroom
  • DDR4 2933MHz CL21 speed matches platform specs
  • ECC registered design protects data integrity
  • 2V operation reduces power draw
  • Validated for Supermicro X11 series motherboards

128GB DDR4 ECC Registered DIMM

This 128GB DDR4 2933MHz CL21 ECC Registered 288-pin DIMM is built for Supermicro X11 server and workstation boards including X11DSN-TS, X11OPi-CPU, X11QPH+, X11QPL and X11SPA-T. It operates at 1.2V with a 4Rx4 organisation and replaces Supermicro part numbers MEMDR412LSL01ER29 and MEM-DR412MH-ER29. Buyers upgrading standard desktop systems or needing unbuffered memory cannot use this module.

Thermals and power profile

The module runs at the standard DDR4 1.2V without a heat spreader, relying on chassis airflow for cooling in 1U or 2U server enclosures. Registered buffering and ECC logic add minimal overhead, keeping power draw predictable for dense multi-DIMM configurations. No active cooling or additional voltage headroom is required for rated 2933MHz operation.

Compatibility and upgrade impact

Backward compatibility with 2133MHz, 2400MHz and 2666MHz buses lets the DIMM slot into existing Supermicro platforms without BIOS updates. ECC registered operation enables error correction and signal integrity for mission-critical workloads, while the 4Rx4 density maximises capacity per slot. The module is JEDEC and RoHS compliant and cannot be mixed with unbuffered memory in the same system.

How it compares

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

Price $763.99
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).
Price per GB $5.97 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 number2R9D44R4128G
Total capacity128 GB
Product type288-Pin DDR4 ECC RDIMM
Performance
Rated speedDDR4 2933 (PC4 23400)
Memory
CAS latencyCL21
ECC supportYes
Buffer typeRegistered
Memory rank4Rx4
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsSupermicro Motherboard X11DSN-TS
Supermicro Motherboard X11OPi-CPU
Supermicro Motherboard X11QPH+
Supermicro Motherboard X11QPL
Supermicro Motherboard X11SPA-T

Other versions of this model

5 more in the same range

Questions about this item

How do I install this 288pin DDR4 ECC RDIMM into a Supermicro X11 motherboard, and what step is often missed?

Align the notch on the 288pin module with the slot key, press firmly until both clips snap shut, and verify the BIOS detects 2933MHz CL21 operation; the step often missed is confirming the memory mode is set to registered ECC in the firmware.

What maintenance or replacement will this 128GB 4Rx4 module need later?

No periodic maintenance is required; replacement is only needed if a module fails, at which point the limited lifetime warranty covers an advanced replacement of the same 128GB DDR4 2933MHz CL21 part.

What limit appears first when this CL21 1.2V registered DIMM runs sustained workloads?

The CL21 latency at 2933MHz is the primary timing constraint under sustained load; the registered buffer adds one cycle, so throughput caps at the JEDEC PC4-23400 rate before thermal or voltage limits are reached.

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