I recently purchased a Dell Inspiron 15” 7000 series laptop for my niece for Christmas. After struggling with it I reformatted and reinstalled the os and put in a m.2 ssd. The attached picture is the memory module in the machine. I noticed the machine was sluggish and sometimes it just hung even before I put the m.2 in.
It looks like to me this machine has 8gb of DDR3/1600 memory vs DDR4/2400 it was advertised to have. I did buy this at Amazon but before I returned it I’d love validation the the attached picture is of DDR3/1600 memory