Why 3200MHZ RAM running at 2133?
Why is my RAM showing at the 2133 MHz frequency when I bought a 3200 MHz one? 3200 is the maximum, the default is 2133. You need to go in your BIOS and enable XMP (or AMP or A-XMP or whatever they call it - it's the same thing, and it's under “overclocking” -> “memory”, most likely).
Is DDR4 3200 compatible with DDR4 2400?
Yes, if it is DDR4-3200 CL22. The memory will automatically bridge to 2400 MHz because that is as fast as your notebook's AMD Ryzen™ 3 3200U processor can run the memory at. You may want to consider installing a much faster performing M. 2 NVMe SSD since your notebook has support for one.
Can I use DDR4 2400 and 2133 together?
Yes, you can use DDR4 2400 and DDR4 2133 RAM modules together, but they will operate at the speed of the slowest module. In this case, both modules will run at 2133 MHz. This is because the system will automatically adjust the speed to match the slowest module to ensure compatibility.
Is 32gb of 2133mhz better than 16GB of 3200MHZ?
When both setups use the same memory channel layout the 3200 MHz will be faster. But when you have 16 GB memory sticks, you might be able to (depending on your motherboard) to use two memory channels with the slower 32 GB ram and use only one memory channel with the faster 16GB ram.