I'm a PC fish so bear with me here

What I did
1) ran the crucial system check thingy which told me which ram is suitable for my system
2) copied the info and bought that type of RAM on Amazon
3) put the ram into the system, rebooted

Got error:
"Recovering lost dram size"

4) Changed some stuff in BIOS (Some Ram settings where on extreme, changed it to Standard / Default / Auto everywhere)
5) Always same error
6) Took the new ram back out: Works again.

What should I do?
Are these two compatible?

If you need more info let me know