Before buying new memory modules, it's important to review your motherboard's specifications as not all motherboards support all RAM types. In addition, even in RAM ocasinos free slotsf the same kind (e.g. g. MHz) and latency (measured in CL) can fluctuate with DDR4. When adding new RAM modules, it's generally advised to match the speed and latency of the existing RAM. However, most motherboards can automatically adjust to different speeds by using the slowest RAM module to run all installed RAM at this rate.