I have a build intended for mining. I'm using Ubuntu 16.04.3 LTS. My specs are as follows:
MoBo: ASUS TUF Z270 Mark 1 LGA1151
CPU: Intel Pentium G4600 3.6 LGA 1151 GHz Dual-Core
RAM: (2x) Patriot Memory Viper Elite Series DDR4 4GB 2400MHz
PSU: Corsair HXi Series, HX1200i, 1200 Watt
GPU(s): (5x) XFX AMD Radeon RX 580
The system works beautifully if there are <= 3 GPUs connected via PCIe VER 007 16x to 1x powered risers.
If I connect one or more additional GPUs, I get a single beep code, and a warning that peripherals such as my keyboard cannot be located, followed by a black screen.
Having done a bit of reading, there were some suggestions to turn off secure boot. I did that, to no avail.
Does anyone in the community have some suggestions?