This listing is for a LOT of RAM. This lot contains the following RAM (5 sticks / 20 GB total RAM).
2 sticks of Hynix 4GB 2Rx8 PC3-10600S-9-10-F2 DDR3 SO-DIMM RAM
Each stick is 4GBTotal RAM: 8GB

Capacity: 4 GB

Rank/Organization: 2Rx8 (Dual-rank, 8-bit chip organization)

Type: PC3 Standard DDR3 memory technology (operates at 1.5V)

Speed: 10600S Peak data transfer rate of 10,600 MB/s, equating to a 1333MHz bus speed in a SO-DIMM (laptop) form factor.

Form Factor: SO-DIMM (204-pin, designed specifically for laptops)

2 sticks of Samsung 4GB 1Rx8 PC3L-12800S-11-13-B4 DDR3 SO-DIMM RAM
Each stick is 4GBTotal RAM: 8GB

Capacity: 8 GB

Rank/Organization: 1Rx8 (Single-rank, 8-bit chip organization)

Type: PC3L (Low Voltage DDR3L, runs at 1.35V)

Speed: 12800S (1600 MHz bandwidth)

CAS Latency: 11

Form Factor: SO-DIMM (204-pin, designed specifically for laptops)

1 stick of Samsung 4GB 1Rx16 PC4-2666V-SC0-11 DDR4 SO-DIMM RAM
Total RAM: 4GB

Capacity: 4GB

Module Type: SO-DIMM (Laptop/Notebook Memory)

RAM Technology: DDR4 SDRAM

Speed: PC4-2666V (2666MHz / PC4-21300)

Rank & Bit Width: 1Rx16 (Single Rank, x16 chip organization)

Error Correction: Non-ECC (Standard for consumer laptops)

Voltage: 1.2V (Low voltage standard for DDR4)

CAS Latency: Typically CL19