Be Careful! MB with "vertical" Aduio ports may be too tall to fit in some 1U cases but our RMC-1G-0, RMC-1GP4, RMC-1A, 1B, 1D, 1K, 1P, 1T, 1M, 1L, 1H, and 1Q have an I/O shield for such MB. Those models can take MB with vertical Audio ports, see I/O shield pictures below for reference! It's safer to use mainboard with horizontal Audio or with no Aduio on board. You may have to unsolder the vertical Audio ports on the MB if you insist on using that kind of MB in the some 1U cases.