I want to upgrade the RAM for my dell xps 15 9750 which is now at 8GB of RAM (2x4GB). I bought 16GB (ddr4 2666 dual-rank) of RAM.
Is it possible to mix single-rank (4GB ddr4 2666) and dual-rank (16GB ddr4 2666) together?
If I mix this together, is there any risk for my laptop?
This is apparently possible, but of course not guaranteed to work.
The Crucial RAM website lists as proposed upgrades for Compatible Memory for Dell XPS 15 (9570) both dual and single ranked RAM, so the motherboard will accept both
However, having two dissimilar RAM sticks will at least certainly disable dual-channel mode on memory access which can double the bandwidth on memory access.
So technically, it's possible, but there is no guarantee it will run and run nicely.
It is highly recommended to buy RAM in a kit rather than mix and matching. And if you mix and match, try to get the exact same modules that are in your computer already to enable dual-channel. Just to stress the point, even mixing and matching two exact same kits may not work for enabling dual-channel.
