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Four black DDR4 UDIMM sticks, no heat spreaders, 288-pin

OWC

OWC 128GB (4x32GB) DDR4 3200MHz CL22 ECC Unbuffered UDIMM 1.2V 288-pin desktop RAM

SKU CH-6ZJV-EFS6R

A 128GB DDR4 3200MHz CL22 ECC unbuffered quad-channel kit for workstations, servers and NAS systems

  • Total capacity128 GB (4 × 32 GB)
  • Rated speedDDR4 3200 (PC4 25600)
  • CAS latencyCL22
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Kit configurationDual Channel Kit

Capacity 128GB (4 x 32GB)

  • 128 GB total capacity from four 32 GB modules
  • ECC error correction protects data integrity in workstations and servers
  • 3200 MHz DDR4 speed with CL22 latency for responsive multitasking
  • JEDEC-standard 1.2 V operation keeps power draw low
  • Backward compatible with 2133, 2400, 2666 and 2933 MHz systems

OWC 128GB DDR4 3200MHz ECC Kit

This kit provides 128GB of DDR4 memory across four 32GB unbuffered UDIMMs. It targets workstations, servers and NAS systems that require error-correcting code for data integrity. Modules run at 3200MHz with a CL22 latency and 1.2V operation. The 288-pin form factor fits standard desktop DIMM slots.

Installation is a straightforward DIY task

Align each module with the slot notch and press firmly until the retention clips click. No heat spreaders are present, so clearance is rarely an issue. The main risk is mixing ECC unbuffered DIMMs with registered or non-ECC memory, which prevents boot. Verify that the motherboard supports unbuffered ECC before purchase. Backward compatibility with 2133MHz, 2400MHz, 2666MHz and 2933MHz speeds eases integration into older platforms.

128GB capacity handles large datasets

Four 32GB modules fill four slots on typical consumer boards, leaving no room for expansion. Workstations with eight slots can add a second kit for 256GB total. The 3200MHz speed feeds multi-core CPUs during rendering, compilation or database workloads. Headroom ends when the platform’s memory controller reaches its maximum supported density per channel.

How it compares

Measured against everything we stock in Desktop RAM, at today’s prices. Recalculated every night.

Price $897.99
Pricier than about 90% of the 3,647 comparable items (median $90.99).
Total capacity 128 GB (4 × 32 GB)
Higher than about 93% of the 3,251 comparable items (median 16 GB).
Price per GB $7.02 per GB
Typical for this category: the median of 3,251 items is $6.75 per GB.

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Specifications

Product
Brand nameOWC
Part number3E2D42R8128S
Total capacity128 GB (4 × 32 GB)
Product colorBlack
Performance
Rated speedDDR4 3200 (PC4 25600)
Memory
CAS latencyCL22
ECC supportYes
Buffer typeUnbuffered
Kit configurationDual Channel Kit
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Recommended forWorkstations, Servers, and NAS Systems
More details
LED lightingNone

Other versions of this model

5 more in the same range

Questions about this item

Will this 128GB kit work in a standard desktop motherboard that only supports non-ECC memory?

No, these modules include ECC functionality and require a motherboard and CPU that explicitly support ECC unbuffered DDR4; most consumer desktop platforms do not.

My system currently runs DDR4 at 2666MHz — will the kit run at that speed automatically?

Yes, the modules are backward compatible with 2133, 2400, 2666 and 2933MHz and will down-clock to match the highest speed your platform supports.

Do I need to populate all four slots, or can I start with two modules and add the others later?

The kit is a matched set of four 32GB modules; you can install two now and add the remaining pair later, but all four must be identical for full 128GB capacity.

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