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In case anyone else comes across the same problem.
We found that Supermicro H11SSL-i motherboard lockups when using MemTest86 after 40 to 45min of running.
The problem was eventually traced back to the installation of the Supermicro PCIe network card based on Intel X710 with 4 * SFP+ ports.
At this moment it isn't know why this combination of network card and motherboard causes a problem, but it does. Maybe a UEFI BIOS memory mapping bug.
Removing the network card fixes the MemTest86 hang.
We found that Supermicro H11SSL-i motherboard lockups when using MemTest86 after 40 to 45min of running.
The problem was eventually traced back to the installation of the Supermicro PCIe network card based on Intel X710 with 4 * SFP+ ports.
At this moment it isn't know why this combination of network card and motherboard causes a problem, but it does. Maybe a UEFI BIOS memory mapping bug.
Removing the network card fixes the MemTest86 hang.