H110-BTC+ won't boot with three GPU's?

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   Hello Everyone, 

I have a new H110 with:

Tiny Linux (NiceHash OS) 
I5 processor 
8gb ddr4 RAM
1000 watt power supply 
Boot from thumb drive. 

5x AMD RX 580 gpu's

I added the first gpu.  No problem.

Second founding.  No problem. 

Third gpu. .... Fails to boot.  Freezes on Asrock splash screen during POST. 

Thought I might have a bad gpu. I picked up two more and tried again.  

Boot fine with any combination of two gpus but adding a third would fail. 

Thought it must be a power issue.  Is the third card too much for my power supply? 

So I moved three risers to a separate power supply and tried again. 

I now have two gpus on the main supply and three on the second supply (no commingling over 12v)

Every combination of cards,  gpus and power supplies leaves me with the same state of failure. 

I also followed the instructions I found for the folks having a similar problem with 9-10 gpus. It didn't help... 

Suggestions?? 

Thanks 

S. 

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PNW_Steve Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 12 Jan 2021 Location: PNW Status: Offline Points: 5	Post Options Post Reply Quote PNW_Steve Report Post Thanks(0) Quote Reply Topic: H110-BTC+ won't boot with three GPU's? Posted: 12 Jan 2021 at 1:13am
	Hello Everyone, I have a new H110 with: Tiny Linux (NiceHash OS) I5 processor 8gb ddr4 RAM 1000 watt power supply Boot from thumb drive. 5x AMD RX 580 gpu's I added the first gpu. No problem. Second founding. No problem. Third gpu. .... Fails to boot. Freezes on Asrock splash screen during POST. Thought I might have a bad gpu. I picked up two more and tried again. Boot fine with any combination of two gpus but adding a third would fail. Thought it must be a power issue. Is the third card too much for my power supply? So I moved three risers to a separate power supply and tried again. I now have two gpus on the main supply and three on the second supply (no commingling over 12v) Every combination of cards, gpus and power supplies leaves me with the same state of failure. I also followed the instructions I found for the folks having a similar problem with 9-10 gpus. It didn't help... Suggestions?? Thanks S.

PNW_Steve Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 12 Jan 2021 Location: PNW Status: Offline Points: 5	Post Options Post Reply Quote PNW_Steve Report Post Thanks(0) Quote Reply Posted: 12 Jan 2021 at 4:48am
	Anyone have any thoughts? I am starting to think that the Asrock H110 may not have been a good choice for this application.

PNW_Steve Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 12 Jan 2021 Location: PNW Status: Offline Points: 5	Post Options Post Reply Quote PNW_Steve Report Post Thanks(0) Quote Reply Posted: 13 Jan 2021 at 5:59am
	Anyone have a thought?

slick Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 18 Feb 2021 Location: Virginia Status: Offline Points: 2	Post Options Post Reply Quote slick Report Post Thanks(0) Quote Reply Posted: 18 Feb 2021 at 11:25pm
	Have the same issue, same MB, only it's when adding a second GPU. I've got 5 GPUs between 2 different vendors, all work, individually. Tried tweaking BIOS settings, to no avail. As soon as I add the second GPU, it locks up at the boot screen. Came across a thread stating if you have a PCIe HD (which I do) that could be related to this issue, however still investigating as it will be a few days before I can get hands on an m.2.

JRD3000 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 21 Feb 2021 Status: Offline Points: 1	Post Options Post Reply Quote JRD3000 Report Post Thanks(0) Quote Reply Posted: 21 Feb 2021 at 10:17am
	I am also having the exactly same problem. Has anyone learned anything helpful?

slick Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 18 Feb 2021 Location: Virginia Status: Offline Points: 2	Post Options Post Reply Quote slick Report Post Thanks(0) Quote Reply Posted: 26 Feb 2021 at 9:24am
	I figured it out after doing some research, watching some youtube videos, etc... ensure you've got 2 x molex are plugged into the motherboard. On at the top of the PCIe bank and the other at the bottom.