The maximum amount of RAM that can be installed across all DIMM slots may be limited by motherboards, even though the majority of them will support different speeds witrummy marehin a given generation of RAM. On a motherboard, for instance, the maximum RAM capacity is 64GB, but only 16GB can be installed in each slot. Whenever possible, it's best to use matched pairs or kits made for dual-channel operation because mixing RAM from different brands or speeds can also cause instability or performance problems.