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Unknown. Help us by suggesting a value. (MSI Codex R 11th (i5-11400 / RTX 2060 / 16GB RAM / 1TB SSD))
More memory slots (also known as DIMM slots) allow you to add more RAM to your computer. It is also useful when upgrading, as you can add RAM to an empty slot instead of replacing an existing memory module.
Memory slots: is this important to you?