There can be wide variations in the number of RAM slots on a motherboard. High-end gaming or workstation boards may have eight or more slots, whereas the majority of consumer-grade motherboards have two to four. Also crucial isata king .s the way these slots are arranged; typically, they are color-coded to show which slots should be filled first for best results. For example, installing RAM in the first and third slots of a motherboard with four slots might be advised in order to enable dual-channel mode, which improves memory bandwidth and system efficiency. Compatibility is an important consideration that should not be disregarded when thinking about upgrading or replacing RAM.