CT2C8G3S186DM - Crucial 16GB Kit (2 X 8GB) DDR3-1866MHz PC3-14900 non-ECC Unbuffered CL13 204-Pin SoDimm Memory

About Crucial 16GB (8GBX2) DDR3L 1866 1.35V SODIMM, 16 GB, 8 x 2 GB, DDR3, 1866 MHz, 204-pin SO-DIMM

Crucial 16GB (8GBX2) DDR3L 1866 1.35V SODIMM. Component for: Laptop, Internal memory: 16 GB, Memory layout (modules x size): 8 x 2 GB, Internal memory type: DDR3, Memory clock speed: 1866 MHz, Memory form factor: 204-pin SO-DIMM, CAS latency: 13

204-pin SODIMM Memory for Mac
In short, 204-pin small outline dual inline memory modules (SODIMMs) are the form factor used to provide DDR3 memory modules for notebook computers and other small form factor computing platforms.

To use DDR3 memory, your system must have both a 204-pin SODIMM slot and a chipset that supports DDR3 memory. A DDR3 SODIMM will not fit into DDR2 or DDR memory sockets.

SODIMMs are smaller and thinner than regular DIMMs, and the 204-pin SODIMM PCBs are always ~2.6 inches long and are usually around 1.18 inches high (though the heights can vary slightly). They consist of a number of memory components (usually black) that are attached to a printed circuit board (usually green). The number of memory components on a 204-pin SODIMM's printed circuit board (PCB) can vary, but the PCB will always have 102 pins on the front and the back both, for a total of 204 pins. The gold pins on the bottom of the SODIMM provide the connection between the memory module and the memory socket.