ASUS ROG H270F Gaming motherboard would not boot up with 4 GPUs

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RoughCoin

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May 30, 2017
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I setup a mining rig with the following:

ASUS ROG H270f Gaming mobo [BIOS up-to-date]
Windows 7 PRO 64-bit [up to date]
4Gb DDR4 DIMM
(4) Gigabyte Geoforce 1050Ti WF OC Graphics cards
Intel Celeron Dual Core Processor
Corsair RM1000x PSU
Corsair 60Gb SSD

When I plug in 4 GPUs to the board, the rig would not boot up but if it's 3 GPUs it would boot up and run fine though I would be unable to go into BIOS setup unless it's only 1-2 GPUs. I have enabled and disabled so many options in BIOS but it wouldn't host 4 GPUs.

The board has 4 PCIEX_1 and 2 PCIEX_16 slots. One of the PCIEX_16 slots runs at a lower mode.

I have also tried to plug them in, in different sequences to no avail. Am at the end of my tether. I am going insane trying to figure this out. Please help!

Cheers
 
Solution
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SOLUTION: I tried telling you...
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DRagor

DRagor

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Jan 23, 2017
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I think it is quite simple - each card takes about 60 W directly from motherboard (even though they have extra power from 6-pin), so 4 cards it 240 W total. The motherboard simply cannot deliver that much. Note that motherboards designed for multiple SLI or CrossFire setups usually come with extra 4-pin or 6-pin plug just for that - to provide extra power required for multiple cards.
Now, you can check if your GPU software allows you to change from where the cards mainly draw power - PCIe slot or directly from PSU. If it does, make it all the way towards using PSU.
 
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R

RoughCoin

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It has enough power. 1000W PSU
 
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R

RoughCoin

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So if the PSU can deliver 300w to the board and an extra 300w directly to the cards, you are saying the motherboard would not supply them with the power needed even though it can draw it from the PSU?

How then are lots of people running 4 - 9 cards off a single board? Same configuration as mine...only difference I have noticed is they use Windows 8.1 or 10 which I would be upgrading to later on today.

PS. The power the cards needs via PCIE is also supplied to them through the PCIE_×1 risers not the motherboard.

 
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DRagor

DRagor

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Jan 23, 2017
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Unfortunately, it does not work that way. Circuits and voltage regulators on the board are built for certain level of current. And they just can't take more, even if PSU is ready to deliver it. This board has been built with 2 GPUs in mind, and it's circuits are only good enough to fully support 2 cards, can try to support 3, but as you found out 4 is just too much.
Obviously there are better boards, that have circuits capable of using higher currents, and so they can power 4 or more cards.
 
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RoughCoin

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May 30, 2017
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SOLUTION: I tried telling you that the cards are not drawing power from the mobo in any way. They are powered directly from the PSU.
Anyway, I got all 4 GPUs running now. In BIOS, set all PCIEX to [GEN1] and enable "Vt- b" and "Above 4G Decoding" then diable as many on-board components as you can. Sharing Conflicts is a major issue when you approach 3+ cards.

If this doesn't work for you, insert GPUs one at a time.
 
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jaybob20

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Jul 2, 2017
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Thanks worked for me :) BTW to others, miners use powered risers so MB PCI power is not used.
 
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N

noguffay

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Dec 26, 2006
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Did you ever get this to work? I have the same board and have run into the same problem. It's not as simple as the other replier's has made it out to be. I don't believe it is a power issue, as I have 7 Asus rog Strix 1080tis working on this board. It's the 8th one that is all about the issue. It is to do with the pciex16-1 slot. I have all the working 7 cards in every slot, including through the two m.2 slots (through adapters) For some reason, as soon as I put a card in the PCIsX16-1 slot, no boot up allowed. It actually gets past the bios posting but hangs between that and windows taking over. Maybe it's a windows issue. I know Win doesn't like more than 8 GPUs, but this is only 7, so the 8th should work windows. It must be a communication issue between pciex16-1 and pciex16-2 or any of the other ports. Maybe there is a max threshold with bandwidth on the ports. Maybe it is the CPU channel support I'm using an i3. How many channels does the CPU you are using support? If you have resolved this issue please inform as to your solution with this board.

 
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RoughCoin

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May 30, 2017
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Hello, If you followed the solution I gave and you still can't boot up with the 8th card....try disabling more on-board components such as audio, USB ports because they might be causing interrupts.

Hope this helps.
 
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noguffay

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Dec 26, 2006
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That's great man. I didn't see any of that full conversation when I first came upon your post. I will try out all of those tips. I never heard of the Vt- b ever mentioned in any other board settings for multi GPU setups. I will definitely try that one. So yeah, it does sound like what you are getting at...shared channel bandwidth, this is what I suspected, but I never put it together with other components on the MB, like the USB, audio. Like I said, it only happened to me with pciex16-1, all the other worked great.
 
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