Question I am attempting to do I/O test on H11/H12 motherboard with AMD EPYC 7xx2 processor. Could you advise how to setup in BIOS? Answer By PCIE device I/O performance test, we recommend referring to performance tuning guide and setup preferred I/O to better achieve performance expectations. Regarding to preferred I/O setup in BIOS, we suggest to boot into OS to gather PCIE device bus/dev/function ID first. Then setup it in BIOS. For example, under Linux, you can use lspci to find device you would like to enable Preferred I/O mode. In this example, we’d like to enable Preferred I/O mode on the SATA controller. The output of lspci will come in <bus>:<dev>.<func> followed by a description provided by the device vendor. Reboot to BIOS setting page and input the <bus> number. By this case, it’s “81”. Was this FAQ helpful? YES      NO Enter Comments Below: Note: Your comments/feedback should be limited to this FAQ only. For technical support, please send an email to support@supermicro.com.  Enter your email address below if you'd like technical support staff to reply:  Please type the Captcha (no space) 6 7 F W FAQ Stats FAQ ID Related Category / Keyword Date Posted Code 31407 N/A 11/28/19     Print Answer