I don't know. I just wanted to have 16GB for a normal PC for internet. I think the speed is overrated. The main thing is that it works. And you don't mix different types or brands together.
I'm using these very bars with a 2017 iMac 27″ Retina 5K. However, the system was unstable and the memory tests (MemTest86) were failing when they were installed in addition to the original strips (2x 4GB). I removed the latter and the problems disappeared. Hopefully this helps!
As I read it, your laptop still has two slots free for So-Dimm RAM with 2400 clock speed. Accordingly, this RAM bar should fit. With my Asus laptop, everything worked and the RAM was recognised immediately.
No, it does not work.
A RAM bar with the following properties must be installed:
DDR3L
SODIMM
1600MHz
Maximum 16 GB
see manual page 26
https://download.lenovo.com/consumer...
before that, it would be interesting to know what kind of dell you have ? type ? Designation ? then you can determine how much RAM fits in there and which ones it should be.