Motherboard not detecting GPUs

[Erick3150]

Hello,
I have a Asrock h110 pro btc+ with 8 AMD GPUs. Im using 6 RX580 and 3 RX5700. The problem I have is that they are not detected by RaveOS or the BIOS. It cannot be the risers because they cannot all be broken. I only get 1 GPU to register when I only connect only one. I tried connecting 2 GPUs and does not work. Only when I connect one. I also tried connecting all of them, and none of them work.
Things I tried.
-Updated BIOS
-Enable 4G encode.
-Set PCIe support to Auto, Gen1, Gen2
-Enable/Disabled onboard graphics.
-Preferred Legacy boot mode
-Disable virtualization.
Here is some pictures of how they are connected and how it shows up on the BIOS.
Thanks
https://drive.google.com/drive/folders/1D7BsnPlTva9fi6LkuZJ7IMiP_ZyosDaZ?usp=sharing

[miner29]

So you connect one it works. 
Connect another one (gpu / riser / cable / edge card) confirm it works by itself.

Then if both work connect those twp sets and boot. 
Make sure you have all the molex plugged into motherboard. 2 of them.
Make sure the first gpu is in the long slpt (hard to tell from the riser pic but believe you have one there).

Youve probably done all this, but figured id ask.

What cpu are you running in the board?

[stoniestfool]

I have about 20 asus 250. I figured i would try an asrock. Had a friend who was having trouble. This boards work with a bit of tweaking. For instance even if the gpu is red in the bios detection , once you boot to the os the gpus do show up. You really need to use the mb video output. Make sure to set all slots to pcie gen 1. If you plan on more than 8 gpus. csm must be disabled. Microsoft virtualization must be disabled under cpu options in bios.above 4g enable vt-d disabled.

[stoniestfool]

Also, the 1st gpu should be in pcie 3.0 16 slot. Then the second goes to the black slot closest to cpu. RThen fill up the black slots before using any of the white ones.

[Daodex]

Since few cards works on the motherboard the first thing your mind you look into is the power pack, is it enough to power all those cards at once? Are you using a 1200watt power supply?

[FP91G]

Sometimes the problem is a malfunction of the motherboard. You have made all the necessary settings.
If your power supply is in good working order and additional power is supplied to the raisers,
then this is either a faulty motherboard or a faulty raiser.
It might be worth testing on a different motherboard.

[Erick3150]

Thank you for all of you guys help. I did some more testing and have gotten different results. I have done this as miner29 suggested,
-Made sure you have all the molex plugged into motherboard. 2 of them.
-Made sure the first gpu is in the long slot, the 16pin one
-I am using an Intel Celeron G3930 and have 8GB of RAM
I am also running HiveOS to mine for Ethereum.
I got the 3 RX5700 working. But for some reason, I cannot get any of the RX580 to work. I do not think its the risers because I swap them around and I still only get the RX5700 to work. So if I have the 3 RX5700 connected, and I connect one RX580. It does not show up on HiveOS, only the RX5700 do. Which if find strange. I can get the RX5700 working, but never 2 of the RX580. I can only get one RX580 to work if I unplug the rest of them.
I also did what stoniestfool suggested
-Switched all the PCI to gen 1
-Disabled virtualization
-Enabled 4GB
-VT-D Disabled
- 1st gpu should be in pcie 3.0 16 slot. Then the second goes to the black slot closest to cpu. Then fill up the black slots before using any of the white ones.
I have 2 power supplies. One 600W one for the MB and 2 580s and a 1200W server PSU for the rest of the cards. And I dont think its the mobo because its band new.
What I am trying to figure out now is why none of the RX580 work together.
Thanks

[miner29]

The RX580 thing is weird.
Do you have any other rig you can try 2 of the rx580s in?  just to prove if its card or rig related.

i have the exact same mobo and proc and 8gb ram running in a rig.  Its got 8 5700xts and 5 - rx570 in it working fine under mmpos.
I also have 13 nvidia running on same board chip in ethos os. 
i dont run hiveOS so cant advise on that.

[Erick3150]

What setting do you have for your BIOS on the mobo running the RX570s?

[fmz89]

Hello,
I have a Asrock h110 pro btc+ with 8 AMD GPUs. Im using 6 RX580 and 3 RX5700. The problem I have is that they are not detected by RaveOS or the BIOS. It cannot be the risers because they cannot all be broken. I only get 1 GPU to register when I only connect only one. I tried connecting 2 GPUs and does not work. Only when I connect one. I also tried connecting all of them, and none of them work.
Things I tried.
-Updated BIOS
-Enable 4G encode.
-Set PCIe support to Auto, Gen1, Gen2
-Enable/Disabled onboard graphics.
-Preferred Legacy boot mode
-Disable virtualization.
Here is some pictures of how they are connected and how it shows up on the BIOS.
Thanks
https://drive.google.com/drive/folders/1D7BsnPlTva9fi6LkuZJ7IMiP_ZyosDaZ?usp=sharing

are you using 2 psu?
and if thats the case try using same psu & molex riser, dont mix it, try using windows first for backup, time is running my friend, each day you losing some profit, better to buy other motherboard rather than pain  trying to troubleshout the hardware,