NeweggBusiness - Silicon Power Hynix IC Compatible for Apple DDR3 DDR3L 16GB (2 x 8GB) RAM 1600MHz (PC3 12800) 204-pin CL11 1.35V Non ECC Unbuffered SODIMM Laptop Memory Module - Low Voltage
DDR3 4GB 8GB 1600 DDR4 16GB 2666 Ram for Laptop 1600MHz 2666MHz Sodimm Macbook DDR3L Compatible With Desktop Kingchuxing _ - AliExpress Mobile
memory - Is DDR4 RAM compatible in a DDR3 RAM slot? - Super User
DDR3 VS DDR3L VS DDR4 of Eglobal Mini PC – EGLOBAL Mini PC Tech Support Blog