Question Motherboard is H12SSW-AN6, when running nVIDIA GPU p2ptest there’s error message and the test results is poor as below. The OS is Ubuntu 20.04 Answer Under Linux, please disable IOMMU in BIOS then run p2ptest. Under Windows Server 2019, please enable IOMMU in BIOS then run p2ptest. 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) K Q K 4 FAQ Stats FAQ ID Related Category / Keyword Date Posted Code 34478 N/A 08/11/21     Print Answer