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I not find the way for work for more than 9 GPUs. All are there work fine, but never more than 9 together. I connect the 10 GPU and the rig directly no boot.
The motherboard is connected with 2 molex + 1 sata with the same power supply. The risers are power supply no more than 2 for every sata line.
The Bios (the lastest 1.60) is configured according to the manual instruccion.

I´m going crazy Anybody help me ? Thank you.

Regards, Pica.

My rig is:
- AsRock H110 Pro BTC+
- Pentium G4400
- 8Gb. Ram
- USB 3.0 32Gb.
- 12 x TUF 3 RX 5700XT O8G GAMING (115 w each)
- 12 x Riser v009s
- 2 x eVGA 1000w
- HiveOS 0.6-147@200720

The Radeon are not 115W … they are more in the Wall...
Also you have to consider Risers + Fans  … You are really in the limit limit of the PSU

And also I hope your cards don't die soon... this is the worst 5700XT in terms of memory heat...

This is the reason why Asus make the TUF EVO... for the mistake of the memory disipator... I hope you try to make some mods in the backplate or something...

Thank for your reply.
The power supply is not the problem, because the GPU idle is - 30w.
Directly no boot with 10 GPUs. With 9 GPUs boot and work fine.
I haven't problem of temperture, the rest of the GPUs (9) work fine at 48C core and 82C memory whit fan at 50% and room temperture of 22-24C

At the wall #1 PSU (4 GPUs) = 580w and #2 PSU (5 GPUs + System) = 840w

First make sure all the HW works independently. Test all GPUs, risers and PCIe slots
in different combinations.

Try booting plain Ubuntu live.

Also describe the boot failure in more detail. Does it fail while booting the OS or does
it fail before that? Any console messages?

I currently have it running 12 gpus. I didn't need to change anything in the bios, however sometimes when it crashes and i do a power cycle, it will not boot up.
I'm able to get it to boot by turning off half the rig to get into bios, and disable csm compatability (uefi only, no legacy). For some reason that setting gets toggled sometimes when the rig crashes.
HTH!

All the HW work fine independently.
The system no boot with more than 9 GPUs. Fail before the BIOS post screen. :(

What GPUs did you has?
You are a lucky man! :)

That doesn't leave much. Power is still the first suspect.

The CPU cannot handle all this quantity of GPU... put less GPU... some time that help… with 10 or 11 can work but not 12...

10x rx5700 and 2x radeon vii. I have the same cpu and ram amount as you.
also try different pcie speeds, mine are set to 2x

I'm running 10 cards due to the psu limitation, so far its been smooth. never had to change anything on the bios except for auto start..

Why? It has 16 lines of PCI-E !
https://ark.intel.com/content/www/es/es/ark/products/88179/intel-pentium-processor-g4400-3m-cache-3-30-ghz.html

2x is the same Gen2 ?
Thanks

Did you ever find an answer to this...I'm having the same EXACT thing happen.

The only difference is that I have 2 1600Watt PSU's

Can only get 9 going

You may try to make the boot delay longer.  It may be the bus just needs a second or two more time to fully register everything.  I usually use a 6 second delay if the bios supports a delay on boot.

And it is NOT thr cpu....i have sevral of these running 13 gpus for last several years no issue.  (g4400 cpuj

Tried delaying the boot by 8 seconds and...nothing

Check all thesein bios:

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 CPU FREQUENCY SCALING to DISABLE.
set CPU PERFORMANCE MODE to ENABLE.
set FAST BOOT to DISABLE.
set CSM to ENABLE.

My first born child will be named Miner 29

Disable CSM in the bios worked!

Thank you!

Glad it helped. 

CPU PCI-E lines are irrelevant. All slots besides the main x16 go through the chipset.

the pci voltage is greater for some reason on 5700's.  I have seen them work fine on some boards past 8-9 and others no dice because the board doesn't not have enough power.  If your board has connectors to plug in more power to it do that, if it don't it's more than likely the board.  I can almost guarantee you if you plugged in other cards it would work all of them no issues.

Disable CSM in this way also takes the 13 gpu but as soon as there is a failure in my case it goes to CSM ENABLE and does not start again, it only happens with the 5700 with the 570 or 580 there is no problem
What can be

Hello. I just replace my old Biostar TB250-BTC Pro with Asrock H110 Pro BTC+ and I have a problem.
System won`t boot ... after display Asrock logo, I see only one " - " in upper left corner :)

OS tested : Ethos and HiveOS
Boot : from USB ( i also try to boot from SSD )
VGA : Onbord ( and with 1 or 12 gpus, same problem )
The MB is connected with 2 molex + 1 sata from the same PSU

I made test with same USB in other rig and works fine, also all GPU`s/risers works without problems ... so problem is from MB. One hour tested diffrent BIOS settings without success ...

Thanks and I`m waiting some advices :)

Remove gpus, go into bios, disable CSM.
On my board with AMD gpus, CSM always gets reenabled if the rig hangs/freezes