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Two green 288-pin DDR4 UDIMM sticks with black chips

SAMSUNG

SAMSUNG 16GB (2x8GB) DDR4 2666MHz UDIMM Non-ECC CL19 288-Pin Desktop RAM M378A1K43CB2-CTD

SKU CH-AS9W-J4MFY

A 16 GB dual-channel DDR4 kit at 2666 MHz with CL19 latency, 1.2 V operation and M378A1K43CB2-CTD modules

  • 16 GB total capacity across two 8 GB modules
  • 2666 MHz DDR4 speed rated at PC4-21300
  • CL19 latency for responsive desktop performance
  • 2 V operation reduces power draw by up to 40 %
  • 288-pin UDIMM form factor fits standard desktop slots

Kit capacity and speed

This kit provides 16GB of DDR4 desktop memory as two 8GB UDIMM modules rated at 2666MHz PC4-21300. Each stick runs at 1.2V with CL19 latency and uses a 1Rx8 unbuffered non-ECC design on a 288-pin interface. It is a straightforward upgrade for systems that accept standard DDR4 DIMMs.

Who it suits and who it does not

The kit fits builders adding matched capacity to a desktop that supports DDR4 UDIMM memory at 2666MHz. It will not serve buyers who need ECC error correction, registered modules or a higher frequency than 2666MHz. Systems limited to lower DDR4 speeds or those requiring a different pin count should look elsewhere.

Sustained load behaviour

Operating at the standard 1.2V helps keep power draw and heat output modest during extended workloads. The modules are built to maintain their rated 2666MHz speed and CL19 timings continuously rather than only in short bursts. Samsung notes the DDR4 design reduces power consumption by up to 40% compared with older memory generations.

Highlights

  • 16 GB total capacity across two 8 GB modules
  • 2666 MHz DDR4 speed rated at PC4-21300
  • CL19 latency for responsive desktop performance
  • 2 V operation reduces power draw by up to 40 %
  • 288-pin UDIMM form factor fits standard desktop slots

Specifications

No published specifications for this item yet.

Questions about this item

Does this kit need a motherboard with DDR4 slots and a 1.2 V supply to run?

Yes, the modules are DDR4 UDIMMs rated at 2666 MHz and 1.2 V, so the board must provide DDR4 slots and that voltage.

Will the 2666 MHz speed hold when paired with older 2133 MHz DDR4 sticks?

The system will run all modules at the lowest common speed, so the Samsung kit will drop to 2133 MHz alongside slower sticks.

How can I confirm the kit is running at CL19 2666 MHz after installation?

Check the memory tab in CPU‑Z or the BIOS SPD readout; it should show DDR4‑2666, CL19 timings and 1.2 V.

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