the SO-DIMM will fit only for the low-voltage processors, so the 4xxx series. I have used for a Lenovo with I5 4210U. He works beautifully and has fitted to the built-in 4GB of RAM. Personally I feel that the notebook with 8GB is faster, with 6GB of free RAM that is however probably just my imagination. During operation of a VM, the course looks different. Fits, is what you want.