Z170 OC Forumla 6 GPU detection on Windows 10

I'm struggling to get this motherboard to detect 6 GPU's.  I have successfully gotten 5 working properly, but not 6.  Yes, it's a mining rig.  On attempting to add the 6th card I immediately get a 55 error on the motherboard error code display.  It was confusing at first because I thought I shorted my RAM with static charge or a similar event, but it turns out the board came back up after a CMOS refresh. 

Edited by whiplashtony - 15 Sep 2016 at 2:25am

Also, still dependent on how many PCI-e lanes your processor has, be sure with this many graphic cards to power BOTH the 8-pin ATX12V1 and the 4-pin ATX12V2

nVidia cards, last I knew, won't run at x4 in SLI and I'm not sure you can overcome that obstacle BIOS wise either.

No Plex chip onboard hampers options if they're nVidia cards. One or two Plex chips would give you freedom over that BIOS limitation using that many nVidia cards if that's what you're working with.

https://www.dropbox.com/s/qjfvjztjgp1jqtq/6gpuasrockconfig.txt?dl=0

whiplashtony wrote: I'm struggling to get this motherboard to detect 6 GPU's.  I have successfully gotten 5 working properly, but not 6.  Yes, it's a mining rig.  On attempting to add the 6th card I immediately get a 55 error on the motherboard error code display.  It was confusing at first because I thought I shorted my RAM with static charge or a similar event, but it turns out the board came back up after a CMOS refresh.  I can get 5 cards detected and fully working with windows by setting the MAX VLOUD setting to 3.5.  I'm no entirely clear on what this does.   I have attempted to set the pcie gen setting to 1st Gen in all the available lanes 1,4,6.  I'm unsure why it doesn't give this option for the 3 other lanes. I have turned off everything possible to partition resources to PCIE, such as disabling onboard audio, com/ethernet, 3rd party USB, and ps2 support.   I can get 6 cards detected in Windows 10 Pro 64bit, but 3 of the cards display an error claiming "it can not gain enough resources, etc).   Can anyone help me with settings to achieve this?  I spent more on this board assuming it would allow this level of control for my application of mining.  If not can anyone in support definitively tell me the board will not support 6 GPU's.   I have booked marked similar threads such as http://forum.asrock.com/forum_posts.asp?TID=3250&KW=z170+gpu&PID=15906&title=z710m-oc-formula-pcie-lane-speeds#15906.

The "MAX VLOUD" setting is really Max TOLUD, or something like that, I can never recall the term.

The setting adjusts the amount of DRAM memory set aside for the OS to use with expansion cards, such as video cards.

Your problem most likely is related to this, since that is a common issue for mining PCs when using more than four video cards. The resources Windows is complaining about should be the amount of DRAM memory it needs to deal with all your cards. If you open Windows Resource Monitor, and click the Memory tab, you might find you have no Standby memory available.

How much memory do you have in this board?

Is that a setting in the UEFI, I can't find it in your board's manual.

Since this is a mining PC, your video cards are running at x1, correct?

If so, then you should not be out of the 16 PCIe 3.0 lanes your CPU provides. You need to confirm this for us.

You are also using the two PCIe x1 slots, which are provided by the board's chipset. The four PCIe x16 slots are connected to the CPU.

You are using the CPU's integrated graphics for your monitor, correct?

Can you increase the "Max VLOUD" value, or set it to Auto? That is the usual fix for this problem.