This listing is for one (1) Samsung 4GB DDR3-1600 Desktop RAM module.
Model: M378B5173QH0-CK0
Form Factor: UDIMM (240-pin, standard desktop)
Capacity: 4GB
Speed: 1600 MHz (PC3-12800U)
Type: DDR3 SDRAM
Voltage: 1.5V
ECC: Non-ECC (Unbuffered)
Rank: Single Rank (1Rx8)

Condition:

Compatibility:
Works with most desktops that support DDR3 1600 MHz memory. Please check your system’s specs before purchase.