Rig doesn't boot when more than 2 graphics cards are connected

Best Answer

• mikeo Member Posts: 176 ✭✭

  July 2017 edited July 2017 Accepted Answer

  The following is an extract from the ethOS knowledge base but is much the same for provisioning under Windows but with this addition - set virtual memory to at least 16GB.
  
  Provisioning Intel boards
  
  If you have an Intel board and have network connectivity issues or are unable to successfully boot with multiple GPUs, follow the below guide:
  
  If you have many GPUs, make sure that no GPU is plugged in directly to any 16x slot. Risers must be used for all GPUs.
  Unplug all GPUs except for gpu0 (ignore all 1x slots, gpu0 is always the 16x PCI-E slot physically closest to your motherboard's CPU socket).
  If your motherboard has molex or PCI-E onboard power jacks, make sure to plug the correct cable into them.
  Follow the guide for Using a keyboard and monitor on ethOS.
  Upon boot, go into the motherboard bios and set the following options (set as many of these options as you can find):
  set VTd INTEL VIRTUALIZATION to DISABLE.
  set ONBOARD AUDIO/SOUND (AZALIA) to DISABLE.
  set IEEE1394 to DISABLE.
  set PCI-E SUBSYSTEM/LANES to x8/x4/x4
  set ONBOARD GRAPHICS to DISABLE.
  set PCI-E GENERATION to GEN2.
  set 4G ENCODING/DECODING to ENABLE
  Save changes and reboot.
  Allow rig to boot completely with just one GPU, then update ethOS.
  After update, reboot, connect the rest of the GPUs.
  Properly distributing riser power to avoid instability
  
  GPUs use a lot of power, and risers must have power balanced properly. Rigs will crash and may never start mining if they are not balanced.
  
  You must use 1 riser per GPU, and GPUs must not be plugged directly into the motherboard.
  If possible, connect no more than 1 riser per PSU cable.
  If you don't have enough SATA cables, remove the SATA adapter from your riser, and connect it to your MOLEX PSU cable.
  Connect your risers to the SATA or MOLEX connector that is physically closest to your PSU box, to reduce heat/resistance.
  Do not connect any more than 2 risers to any single SATA or molex cable from your PSU.

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