This listing is for a quantity of (2) 2GB Ram Cards totaling 4GB. 

You will receive:

•4GB (2x 2GB) Modules of 1333MHz DDR3 Single Rank Memory 

These are tested and working.

Specs:

ManufacturerKingston
Manufacturer Part #K1N7HK-ELC
Memory TypeDDR3 SDRAM
Capacity2GB
Data Transfer Rate1333Mhz
Pins240 Pin
Bus TypePC-10600
Error CorrectionNon-ECC
Cycle Time1.5ns
CasCL9
Memory Clock166Mhz
RankRank 1
Voltage1.5