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

OWC

OWC 2R9D44R4128G 128GB DDR4 2933MHz CL21 ECC Registered RDIMM memory upgrade

SKU CH-RZ40-S6ERS

128GB DDR4 2933MHz ECC registered RDIMM 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 lets you run larger workloads in memory
  • DDR4 2933MHz CL21 speed delivers high throughput for server tasks
  • ECC Registered design detects and corrects data errors automatically
  • 2V operation reduces power draw in dense configurations
  • Validated for Supermicro X11DPG-SN, X11DPH-I, X11DPH-T, X11DPH-Tq and X11DPi-N motherboards

Server-grade ECC RDIMM upgrade

This 128GB DDR4 2933MHz CL21 registered module targets Supermicro X11DPG-SN, X11DPH-I, X11DPH-T, X11DPH-Tq and X11DPi-N motherboards. It delivers error-correcting, buffered memory for workloads that demand data integrity and high capacity. The kit is not compatible with standard desktop boards or unbuffered DIMMs.

Thermals and power profile

Operating at 1.2V, the module runs without a heat spreader and relies on chassis airflow for cooling. Registered buffering reduces electrical load on the memory controller, helping to keep power draw predictable during sustained server tasks. No active cooling is included or required by the specification.

Build integration

The 288-pin DDR4 form factor fits the listed Supermicro server platforms and supports backward-compatible speeds of 2133MHz, 2400MHz and 2666MHz. ECC registration frees the memory controller from parity duties, while the 4Rx4 organisation maximises density per slot. Mixing with unbuffered memory is not supported.

How it compares

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

Price $647.99
Pricier than about 55% 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 $5.06 per GB
Cheaper than about 76% 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 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 X11DPG-SN
Supermicro Motherboard X11DPH-I
Supermicro Motherboard X11DPH-T
Supermicro Motherboard X11DPH-Tq
Supermicro Motherboard X11DPi-N

Other versions of this model

5 more in the same range

Questions about this item

How do I install the 288-pin DDR4 2933MHz RDIMM into a Supermicro X11DPH-T motherboard and what step is often missed?

Power down the server, open the chassis, align the notch on the module with the slot key, press firmly until both ejector clips lock, then verify in BIOS that all 128GB are recognised at 2933MHz.

What maintenance or replacement will the 4Rx4 ECC Registered DIMM need over its service life?

No scheduled maintenance is needed; ECC corrects single-bit errors on the fly, and the module should only be replaced if uncorrectable errors appear or a memory diagnostic reports a hard failure.

What limit appears first when the 1.2V RDIMM runs sustained workloads on a Supermicro X11DPG-SN?

The registered buffer and 4Rx4 organisation add one clock cycle of latency, so the CL21 timing at 2933MHz becomes the primary latency ceiling before bandwidth or thermal limits are reached.

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