I have a laptop with 4GB of built-in DDR4 RAM running at a frequency of 1193.2 MHz. I'm considering adding another RAM stick with a frequency of 3200 MHz. My CPU is an Intel Celeron N4020 at 1.10GHz. I've heard from a relative that a technician mentioned there could be issues with this setup, but they didn't specify what those problems might be. Can anyone provide some clarity on this?
2 Answers
If you add the 3200 MHz RAM, your laptop will run it at the speed of the slower module, which is 1193.2 MHz in this case. So while you can use them together, you won’t get the benefit of the faster RAM speed.
Yes, it will work, but only up to the speed of the slower RAM. That means the 3200 MHz RAM will effectively 'slow down' to match the 1193.2 MHz stick. Just keep that in mind when upgrading!
Also, keep in mind, sometimes mixing speeds can lead to stability problems. It's not always guaranteed that it will work without hiccups.

I heard from someone else that the CPU's memory controller might only support speeds up to 2400 MHz. This could mean compatibility issues if you try to use the faster RAM.