ASROCK IMB-X1314 User Manual page 16

M.2 Key-M Socket (M2_M1):
M.2 Key-B Socket (M2_B1):
M.2 Key-M Socket (M2_M2):
M.2 Key-E Socket (M2_E1):
+3VSB
+3VSB
+3VSB
+3VSB
16