i'm trying to upgrade my laptop RAM capacity.
I use an 2 years old ACER ASPIRE VX15 with a 8GB RAM module KINGSTON ACR24D4S7S8MB-8 (8GB DDR4 PC4-19200 2400MHz 1rx8 1.2v NON-ECC 260-pin SO-DIMM).
My question is: Is it a good idea to buy the Crucial CT8G4SFS824A (8GB DDR4 PC4-19200 2400MHz 1rx8 260-pin SO-DIMM) to add it to my laptop so i'll have 16GB of RAM?
Or should i instead buy the KINGSTON KVR24S17S8 (8GB DDR4 PC4-19200 2400MHz CL17 1.2v NON-ECC 260-pin SO-DIMM) knowing that i can't get it yet for a long time?
And is it even possible to use 4GB instead of 8 GB? Of course i'm asking in case they don't match and lead to crashes.
Thanks!