SK Hynix HMA81GS6DJR8N-XN 8GB DDR4 PC4-3200AA-SE1-11 for XPS 9700 9500 X1 Carbon Extreme Gen 3 Alienware 51M R2 Asus Laptop (8GB DDR4 PC4-3200AA) at Amazon.com
Hynix original 8GB, 240-pin DIMM,Unbuffered, NON ECC, DDR3 PC3-12800 desktop memory module at Amazon.com
SK Hynix 8GB (1 x 8GB), 204-pin SODIMM, DDR3 PC3L-12800, 1600MHz memory module at Amazon.com
Ram Memory 8GB kit (2 x 4GB) DDR3 PC3-12800,1600MHz, 204 PIN SODIMM for laptops at Amazon.com