Easier than opening it.
Just down load CPU-z. run it and you will see two memory tabs ar the top:
A) Memory. How it is being used. This tab shows type, amount, channels, NB Freq, Dram Freq Plus Timings.
B) SPD. Has a pull down windows that shows info by Slot #.
If Only one stick, then you will only see infor for slot 1. This page tells you about the Ram; such as Manuf part Number and the various Speed/CL ratings stored on the Module, also shows XMP rating (This is normally the advertised Speed)
... This is helpful as if you only have a single 4 gig stick, then you want to MATCH that with a second 4 gig module that has the exact same specs as what is installed.
PS. Most laptop makers cheap out by putting in two Ram modules. Two...