B450-A PRO MAX
AM4

4 x DDR4 memory slots, support up to 128GB
Supports 2667/ 2800/ 2933/ 3000/ 3066/ 3200/ 3466/ 3733/ 3866/ 4000/ 4133 MHz(by A-XMP OC MODE)

1 x PCIe 3.0 x16 slot (PCI_E1)
1 x PCIe 2.0 x16 slot (PCI_E4, supports x4 mode)
1 x 4 x PCIe 2.0 x1 slots1

1 x M.2 slot (Key M
4 x SATA 6Gb/s ports

2 x USB 3.2 Gen2
2 x USB 3.2 Gen1
6 x USB 2.0 (High-speed USB)

1 x Realtek® 8111H Gigabit LAN controller

Alaplap info
https://www.msi.com/Motherboard/B450-A-PRO-MAX/Specification

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