How Are RAM Slots Numbered?

Most computer motherboards have two or four RAM slots. The RAM slots are numbered differently depending on the motherboard manufacturer.

The most common numbering scheme has the slots labeled 0, 1, 2, and 3 going from left to right. However, other manufacturers might number the RAM slots differently.

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The numbering of the RAM slots can be important when adding or upgrading RAM. Some motherboards have specific requirements for what order the RAM must be installed in.

For example, a motherboard might require that RAM be installed in pairs, with the first slot being occupied by the Lowest-capacity RAM module and the second slot being occupied by the highest-capacity module. Or a motherboard might require that all four slots be filled before any dual-channel operation can occur.

When adding or upgrading RAM, it’s best to consult your motherboard’s manual to see how the manufacturer recommends populating the RAM slots.