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Eight green SO-DIMM sticks with black chips, no heat spreader, 260 pins each

OWC

OWC 128GB (8x16GB) DDR4 2933MHz CL21 ECC SO-DIMM laptop RAM

SKU CH-JMQF-XJN2F

128 GB kit of eight 16 GB DDR4-2933 ECC SO-DIMMs running at CL21 and 1.2 V for laptops, NAS and micro servers

  • Total capacity128 GB (8 × 16 GB)
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latencyCL21
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Kit configurationDual Channel Kit
  • 128 GB total capacity across eight 16 GB modules
  • DDR4 2933 MHz speed with CL21 latency for responsive performance
  • ECC support detects and corrects data errors automatically
  • 2 V low-voltage operation reduces power draw and heat
  • Backwards compatible with 2666 MHz, 2400 MHz and 2133 MHz systems

128GB ECC SO-DIMM kit for laptops and NAS

This 128GB kit contains eight 16GB DDR4 2933MHz CL21 ECC unbuffered SO-DIMM modules. It targets laptops, all-in-one systems and NAS devices that support 260-pin DDR4 memory with error correction. The kit is not suited for desktop DIMM slots, non-ECC platforms or systems limited to lower maximum capacities.

Sustained load stability with ECC

ECC circuitry detects and corrects single-bit errors during continuous operation, reducing silent data corruption in long-running workloads. JEDEC-compliant 1.2V voltage and CL21 timings maintain steady throughput without voltage scaling. Backward compatibility with 2666MHz, 2400MHz and 2133MHz allows the modules to run at the highest speed the platform negotiates.

Straightforward DIY installation

The 260-pin SO-DIMM form factor fits standard laptop and NAS slots without tools beyond a screwdriver. No heat spreader means low-profile clearance in tight chassis. Common issues arise when the system BIOS does not enable ECC or when the platform maximum memory per slot is below 16GB, preventing the full 128GB from being recognised.

How it compares

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

Price $962.99
Pricier than about 92% of the 2,079 comparable items (median $70.99).
Total capacity 128 GB (8 × 16 GB)
Higher than about 94% of the 1,886 comparable items (median 16 GB).
Price per GB $7.52 per GB
Pricier than about 66% of the 1,886 comparable items (median $5.94 per GB).

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Specifications

Product
Brand nameOWC
Part number2C9D41R8128K
Total capacity128 GB (8 × 16 GB)
Product type260-Pin DDR4 SO-DIMM
Performance
Rated speedDDR4 2933 (PC4 23400)
Memory
CAS latencyCL21
ECC supportYes
Buffer typeUnbuffered
Kit configurationDual Channel Kit
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Recommended forLaptops, All-in-One Systems, and NAS Systems

Questions about this item

How much power does the 1.2V DDR4 2933MHz kit draw when the laptop runs all day?

Each 16GB module operates at 1.2V, the standard DDR4 voltage, so total power scales with the eight modules installed and the system's memory controller load.

What must the laptop or NAS already provide for these 260-pin ECC SO-DIMMs to work?

A DDR4 SO-DIMM slot that accepts 260-pin unbuffered ECC modules and a BIOS or firmware that enables ECC functionality.

Will the 2933MHz CL21 sticks run stably in a system that currently uses 2400MHz or 2666MHz memory?

Yes, the kit is backwards compatible with 2666MHz, 2400MHz and 2133MHz speeds and will downclock automatically to match the slower bus.

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