The manufacturer of my notebook gives the "Memory note: DDR4 2133 Mhz" in the data sheet. So that means from the usual So-Dimm types
DDR4-1600 (PC4-12800)
DDR4-1866 (PC4-14900)
DDR4-2133 (PC4-17000)
DDR4-2400 (PC4-19200)
DDR4-2666 (PC4-21333)
DDR4-2933 (PC4-23466)
DDR4-3200 (PC4-25600)
the one in the 3rd line from the top fits exactly.
Can you say that DDR4 RAM with a lower nominal clock rate (i.e. DDR4-1600 and DDR4-1866) will most likely not work? And vice versa, DDR4 RAM with a higher nominal clock rate (i.e. DDR4-2400 and faster) will work, even if it is possibly a little more expensive?
(By the way, my notebook is a "Fujitsu E556", but I would also be interested in other notebook types in general.)
I don't think there are any lower clock rates. And if you buy RAM with a higher clock rate than your laptop can handle, then the RAM will simply be clocked down.
It is not a problem to incorporate building blocks that have a higher value. These could work as fast as indicated on it, but do not have to. This is like depressing the gas pedal less.
If you were to install some with a lower rate, they would also have to work if it can be set to this rate in the BIOS. But someone who knows for sure can clarify that.
