For a Sony VAIO VPCEC4M1E / BJ I was looking for these memory modules: M51264H70: Kingston 4GB PC3-8500 DDR3-1066 204-pin SODIMM with this exact wording the price is rather prohibitive (over 100 with the port) I have some fears a compatibility problem with the bars Komputerbay 8GB (2x 4GB) DDR3 SODIMM (204 pin) 1066Mhz PC3 8500 8 GB, but I started and I must admit that here did ... recognized and therefore functional ...