The LM model is rated at 25W compared to M and UM at 35W and 18W respectively. It is capable of operating at 2.8Ghz with turbo boost (from 2.0Ghz). Other features include hyper threading, virtualisation with directed I/O, and enhanced Intel speedstep. Note that the 620LM is not sold individually and it has embedded options available (620LE). Also, notebooks equipped with the 620LM can only handle up to 8GB of DDR3 memory which might turn away some users seeking a notebook for heavy computational uses.