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Four green 240-pin DDR3L ECC RDIMM modules in static bags

OWC

OWC 128GB (4x32GB) DDR3L 1600 ECC Registered RDIMM Memory Upgrade Kit

SKU CH-HW5M-EWWA6

128 GB DDR3L ECC registered RDIMM kit (4 × 32 GB, 1600 MHz, CL11, 1.35 V) for Supermicro X9 series workstations and servers

  • Total capacity128 GB (4 × 32 GB)
  • Rated speedDDR3L 1600 (PC3L 12800)
  • CAS latencyCL11
  • Rated voltage1.35 V
  • Buffer typeRegistered
  • Memory rank4Rx4

Capacity 128GB (4 x 32GB)

  • 128 GB total capacity from four 32 GB modules
  • DDR3L 1600 speed with CL11 latency for server workloads
  • ECC registered design detects and corrects data errors
  • 35 V low-voltage operation reduces power draw
  • Validated for Supermicro X9DRL, X9DRT, X9DRW, X9DRX+, X9QR7 motherboards

Server ECC RDIMM Kit

This OWC kit provides 128 GB of DDR3L ECC Registered memory across four 32 GB modules. It is built for workstations, servers and NAS systems that require registered DIMMs and will not operate in standard desktop platforms.

Low-Voltage DDR3L Operation

The modules run at 1.35 V and conform to the PC3L-12800 1600 MHz CL11 JEDEC standard. Lower voltage reduces power draw and heat output compared to standard DDR3, helping dense server configurations stay within thermal limits.

240-Pin Registered Form Factor

Each stick uses the 240-pin RDIMM interface with 4Rx4 organisation and no heat spreader. The registered design adds a clock cycle of buffering for signal integrity in multi-DIMM populations, and the kit is validated for the listed Supermicro X9 series motherboards only.

How it compares

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

Price $332.99
Typical for this category: the median of 21,161 items is $397.99.
Total capacity 128 GB (4 × 32 GB)
Higher than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $2.60 per GB
Cheaper than about 91% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number1R6T34R4128S
Total capacity128 GB (4 × 32 GB)
Product type240-Pin DDR3L ECC RDIMM
Performance
Rated speedDDR3L 1600 (PC3L 12800)
Memory
CAS latencyCL11
ECC supportYes
Buffer typeRegistered
Memory rank4Rx4
Heat spreaderNo
Power
Rated voltage1.35 V
Compatibility
Compatible systemsSupermicro Motherboard X9DRL Series
Supermicro Motherboard X9DRT Series
Supermicro Motherboard X9DRW Series
Supermicro Motherboard X9DRX+ Series
Supermicro Motherboard X9QR7 Series

Other versions of this model

5 more in the same range

Questions about this item

How do I install the 4Rx4 DDR3L RDIMMs in my Supermicro X9DRX+ and which step is often missed?

Power down, open the chassis, align the 240-pin key notch with the slot, press firmly until both ejector clips click, then populate all four channels per the board manual; the step most often missed is confirming the BIOS recognises all 128 GB at 1600 MHz before closing the case.

What maintenance or replacement will the 1.35 V ECC registered kit need over time?

No scheduled maintenance is required; dust the slots annually with compressed air and run a memory diagnostic if the OS logs corrected ECC errors, replacing a module only when persistent uncorrectable errors appear.

What limit appears first when the 128 GB kit runs sustained workloads on an X9DRW board?

The memory controller’s maximum supported capacity and rank-per-channel limit is reached first; the X9 chipset tops out at 128 GB with quad-rank modules, so no further DIMMs can be added without a platform change.

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