I bought a used Latitude E7390. It has an 8 GB stick of DDR4-2400 /PC4-19200 RAM. I wanted to increase the amount of RAM to 16 GB and bought an additional stick of the 8 GB RAM DDR4-2400. When the additional stick arrived, I opened up the back of the machine and was shocked to learn it only has a socket for 1 stick of RAM, not two like most laptops have. Fortunately, I had another computer that could benefit by the stick I had purchased for the E7390, and I placed it there. 

So I checked online for a 16 GB stick and noticed the prices were a bit high for me at this time, but I also remembered that I have a Shuttle DH110SE with two sticks of 16 GB laptop DDR. I know that 32 GB is a lot more than I need in that machine and wondered if I could pull one of those 16 GB sticks out of the Shuttle and place it in the E7390. I checked, and the 16 GB sticks are DDR4-2133 /PC4-17000 RAM.

So, before I open up each machine and move RAM around, I want to know if the DDR4-2133 /PC4-17000 RAM will work in my Dell Latitude E7390? I know it is a little bit slower RAM, but it's increased amount should make up the difference, particularly while multitasking.