MSI MPG Z790I EDGE WIFI Manuel D'utilisation page 31

M2_1~3: M.2 Slots (Key M)
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Important
Intel® RST only supports PCIe M.2 SSD with UEFI ROM.
Installing M.2 module into M2_1 slot
1. Loosen the screws of M.2 Shield Frozr heatsink.
2. Lift up the M.2 Shield Frozr heatsink and remove it.
3. Insert your M.2 SSD into the M.2 slot at a 30-degree angle.
M2_1
M2_2
2 2
1 1
3 3
30º 30º
29
M2_3
1 1