Identical pairs of modules must be used for dual module configurations.
DDR4 3200MT/s Non-ECC Unbuffered SODIMM CL22 2RX8 1.2V 260-pin 8Gbit
DDR4 3200MT/s Non-ECC Unbuffered SODIMM CL22 2RX8 1.2V 260-pin 16Gbit
DDR4 3200MT/s Non-ECC Unbuffered SODIMM CL22 1RX8 1.2V 260-pin 16Gbit