SAMSUNG M378A2K43DB1-CTD 16GB DDR4 2666 CL19 1.2V 288-pin UDIMM desktop RAM

16GB DDR4 2666 UDIMM module

This Samsung desktop memory module delivers 16GB of DDR4 capacity at 2666 MT/s with a CL19 latency. It is built for standard consumer motherboards that accept unbuffered, non-ECC UDIMMs running at 1.20V. The green PCB uses a 2Rx8 chip arrangement across 288 pins. Buyers who need ECC error correction or registered buffering for server platforms cannot use this module.

Speed grade DDR4 2666 PC4-21300

The decisive specification is the DDR4 2666 speed rating, labelled PC4-21300, paired with CL19 timing at 1.20V. This combination determines whether the module matches the memory controller’s supported JEDEC profile and whether the system can boot at the rated frequency without manual adjustment. If the platform only qualifies slower or faster JEDEC speeds, this module may downclock or require a BIOS update.

Tool-free DIMM slot installation

Installation is a simple press into a 288-pin DDR4 UDIMM slot until the retention clips click, requiring no tools or cables. The bare green PCB has no heat spreader, so it fits tight spaces but offers no thermal margin for sustained heavy loads. A common issue is seating the module incompletely, which causes a no-post condition; always verify both clips are fully engaged.