Asus PRIME TRX40-PRO Manual page 30

2. M.2 slot
The M.2 slot allows you to install M.2 devices such as M.2 SSD modules.
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3. M.2 Wi-Fi slot
The M.2 Wi-Fi slot allows you to install an M.2 Wi-Fi module (E-key, type 2230).
The M.2 Wi-Fi module is purchased separately.
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M.2_1 and M.2_2 sockets support PCIe 4.0 x4 M Key design and type 2242 / 2260 /
2280 / 22110 storage devices.
M.2_3 socket supports PCIe 4.0 x4 and SATA modes vertical M Key design and type
2242 / 2260 / 2280 / 22110 storage devices.
The M.2 SSD module is purchased separately.
Use the bundled bracket to install a vertical M.2 SSD module to the M.2_3 socket,
refer to the M.2 Installation section for more details.
Chapter 1: Product Introduction