Crucial
4GB 1600MHz DDR3L Single Ranked Desktop Memory Module (CT51264BD160BJ)

DDR3L 240-pin DIMM

The 4GB (1 x 4GB) 240-Pin UDIMM DDR3L PC3L-12800 Memory Module Kit from Crucial is a 4GB RAM module kit. 240-pin DIMMs are used in DDR3 memory for desktop computers and transmits data more quickly than previous memory modules. A DIMM consists of a number of memory components (usually black) that are attached to a printed circuit board (usually green). The gold pins on the bottom of the DIMM provide a connection between the module and a socket on a larger printed circuit board. The pins on the front and back of a DIMM are not connected to each other.

Each 240-pin DIMM provides a 64-bit data path. To use DDR3 memory, your system motherboard must have 240-pin DIMM slots and a DDR3-enabled chipset. The number of black components on a 240-pin DIMM can vary, but it always has 120 pins on the front and 120 pins on the back, for a total of 240. 240-pin DIMMs are approximately 5.25″ long and 1.18″ high. 240-pin DDR3 DIMMS have only one notch within the row of pins.

This high-density memory module contains 8 chips, each providing 512 MB of RAM.

Please make sure you have checked compatibility between the memory you want to purchase and the motherboard or notebook for which the memory is intended to be used. If the package is opened and the memory is not in resealable condition it cannot be returned for credit.
        
 Kingston, Crucial, OWC & Transcend memory - when not in stock can be ordered on request - takes 5-15 business days.

Check Crucial compatibility here:  https://www.crucial.com/store/advisor