HP 4GB 1600MHZ DDR3L 1DM 1040 - 4 GB - DDR3-1600/PC3-12800 DDR3 SDRAM - 1600 MHz - DIMM
CTO 8GB 1D+4GB
Technical Specifications:
Memory Size: 4 GB
Memory Technology: DDR3 SDRAM
Memory Speed: 1600 MHz
Memory Standard: DDR3-1600/PC3-12800
Form Factor: DIMM