You have to connect both power inlets. Otherwise there will be not enough power to run all 13 PCIE slots.
- First, Reset BIOS by removing BIOS battery (wait at least 30 seconfs)
- connect just one GPU to the x16 slot (longest one). Power up (push buttom on motherboard) and enter BIOS. Modify the values in BIOS as written below:
OC Tweaker\Voltage Conf:
PCH VoH: 1200 mV
VCCIO: 1200 mV
Advanced\Chipset Conf:
Above 4GB mmio: Enabled
VT-d: Disabled
All PCIE link speeds: Gen2
All ASPM Supports: Disabled
IOAPIC 24-119: Enabled
IGPU: Enabled
HD Audio: Disbaled
Reset Power Loss: power ON
For LINUX:
-Insert your HiveOS install USB (ıf you use 5700 XT you have use BETA versions (HivesOS: 5.6.0-200909-hiveos-beta). Other versions does not work!
-Save and exit BIOS
-When HiveOS install finished, it will power off automatically
- Power on again and run your rig with only one GPU (you have to create and assign Flight Sheet)
- If everything seems OK (1 GPU is mining etherium) now you can pass to stage for remaining 12 GPUs
- Restart it and enter BIOS. In Boot section “Disable” CSM.
- Save and exit. When rebooted, cut the power before boot. Now connect all GPUs to the remaining x1 slots (short ones). Check that all GPU’s risers sand power connections are provided and correct .
Power on again and All 13 GPU should be recognized suddenly and work without any problem.
One important point!: If number of connected GPUs drop to below 10, CSM will be “Enabled” automatically and it will not boot. In this case you have to clear BIOS again by removing BIOS battery, wait 30 seconds and start everything from beginning.
If still white slots do not work, there should be another problem that I do not know. Contact to AsRock.