Expansion Slot - ASROCK STX-1500 User Manual

2.4 Expansion Slots
There are 2 M.2 sockets and 1 SIM socket on this motherboard.
SIM socket:
1 x SIM socket connected to M.2 key B.
M.2 slots: 1 x M.2 (M2_M1, Key M, 2242/2260/2280) with SATA3 and PCIe Gen4
x4 for SSD. (Shared with SATA3_0.)
1 x M.2 (M2_E1, Key E, 2230) with PCIe x1, USB 2.0 and CNVi for
Wireless.
1 x M.2 (M2_B1, Key B, 3052/3042/2280) with PCIe x1 / USB 3.2 /
USB2.0 and SIM for 4G/5G.
M.2 Key-M Socket (M2_M1) M.2 Key-E Socket (M2_E1)
14
M.2 Key-B Socket (M2_B1)
USB3_RX-
USB3_RX+
GND
USB3_TX-
USB3_TX+
PERn0
PERP0
PETn0
PETP0