Review on High-Performance Samsung OWC 4.0GB PC3-10600 DDR3 1333MHz SO-DIMM Memory - Boost Your System's Speed and Efficiency by Shawn Trotter

Adding to my SONY VAIO SVS13A12FXS. This laptop has only one memory slot. There is 4G on the board that cannot be removed. This memory has exactly the same characteristics as the on-board memory. I won't trust the compatibility list on the Crucial website, especially if you already have memory soldered to the board. According to the Crucial website, DDR3-1600 will work with DDR3-1333. I think it's better to use the same memory if possible.