How Many PCIe Lanes Does M.2 Slot Use? - PC Guide 101
The B550MX/E PRO is a MicroATX motherboard with a B550 chipset compatible with the Ryzen 5000 series.Simple yet uncompromised configurations include 10-phase power circuits with "Digital PWM" and PCIe 4.0 and PCIe 4.0 M.2 slots.
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Not to be confused with the length of motherboard PCIe slots (such as x16, x4, or x1), the GPU slot type refers to how many PCIe slots a graphics card takes up vertically, based on how thick/wide the card is.
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Having the option to add more PCIe slots is essential if the selection of PCIe slots on your motherboard isn’t enough to accommodate more expansion cards.
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If you need more PCIe slots, you will need to replace your motherboard with one that has more slots.