Topic: Can't get 6th GPU to work - 5 GPU's Running (Read 849 times)

I have this problem too. Is not the card, I tested all of them individually and they worked, they just don`t work the 6 together. I use simple mining OS, so I think the problem is on the mobo bios. I saw a lot of youtube videos and have tried to change some setting on the mono bios but did not had success. I read somewhere that i should set "enable 4g encoding" but my mobo bios don't have this option. Is a Gigabyte z270x-desingare. Any suggestions?

Fixed thanks to the responses on this thread. Thank you to everyone!

Thanks again,
Darcendsun

I'm having the same problem with my 6th GTX 1070 but nobody will acknowledge me in my thread. hah

*cries*

Ive been scouring the web for a week now and cant find answer.

4GB Ram is fine. You need to set Virtual Memory to at least 16GB. Follow this guide to change the other settings as well.

https://www.youtube.com/watch?v=7Zsv-3QDzJQ

Elder III,

Thank you so much for your guidance here. Vann, I also appreciate your input!

My first step was to try windows 10 since I would have had to reinstall windows 7 to make it UEFI, so instead of reinstalling I just upgraded first to see if that would work.

IT WORKED!! All 6 cards came up and with the 16.9.1 driver all went well!

Kinda....

Now, as I start my miner (Claymore zCash miner) my memory gets to 100% and crashes the rig. Even with absolutely nothing running on windows startup my memory is at 37% usage...just from the startup services! So yeah, as soon as I start my miner it blue screens the rig because the memory maxes out. I'm using a stick of 4 GB RAM, everywhere I read while purchasing said that would be enough for 6 cards. I can but an 8 GB stick if need be, but I feel like this may be a windows 10 thing that "using" more memory than it should.

Any guidance there would be greatly appreciated!

Thank you,
Darcendsun

This is a friend of Darcendsun, for some reason, bitcointalk is not letting him post so I am posting this for him!

Here's a link for the 16.9.1 drivers from Guru3D, you can choose the Windows version you have at the bottom of the page. -- http://www.guru3d.com/files-details/amd-radeon-software-crimson-16-9-1-driver-download.html

Yes, create a GPT partition scheme for the drive and and install Windows in UEFI mode. To create a bootable UEFI Windows install flash drive you can use Rufus. Make sure to select 'GPT partition scheme for UEFI' from the drop down menu in Rufus when creating the flash drive and boot to the UEFI installer from the motherboard boot menu.

https://www.intel.com/content/dam/support/us/en/documents/boardsandkits/Windows-7-UEFI-Installation.pdf

Hey Vann,

Thanks for the advice. I'll stop by the office where my rigs are tomorrow and give this a try and get back to you!

Just to clarify, I DO want it in UEFI mode...I DO NOT want it in legacy mode. Correct?

Thanks again,
Darcendsun

Thanks for the reply, Elder III!

I've used DDU a lot while trying different drivers while running it in safe mode. One of the problems I mentioned above is that when I go to AMD's site to download old drivers, I download and install them (tried both custom and express installs) but when I inspect the GPU in the device manager (like in the pictures on my original post) it says the driver installed is the most recent driver instead of the old one I downloaded (I make sure NOT to click the "auto update drivers" box on install as well). Do you happen to have a link I could use? If nothing else pops up soon I'll definitely try Windows 10. Plug and play says heavenly at this point!

Thanks again,
Darcendsun

Check if Windows in installed in UEFI mode, not Legacy for 6 GPU's to work.

https://www.eightforums.com/tutorials/29504-bios-mode-see-if-windows-boot-uefi-legacy-mode.html

I know that people have had to go through some workarounds at times to get 6 GPUs working on Windows 7. We are mining with Windows 10 Pro on all of our rigs and I can confirm that particular motherboard should be plug and play with 6 GPUs and Windows 10 Pro, using 16.9.1 drivers or 16.12.2 drivers from AMD.

If you haven't done so already, download DDU and run it in safe mode to uninstall your GPU drivers and then install one of the two AMD drivers that I mentioned above. If that doesn't work (and nobody with Windows 7 exp comments) consider buying a Windows 10 key for $15 and install that.

Hey guys,

I'm new to the mining world and I'm running into a problem on my 6 GPU mining rig.

Problem: 5 of my GPU's are up and mining, but my 6th GPU keeps giving me a Code 43 error

Setup:
    Motherboard: ASRock H81 Pro BTC R2.0
    GPU: Sapphire Radeon RX 470 4GB (6 of them)
    CPU: Intel Celeron G1840 Processor
    PSU: Antec 1300W
    RAM: 1 stick of 4 GB Kingston HyperX FURY DDR3
    OS: Windows 7 64-bit
    Using PCIe Risers (6 of them)

What I've Tried:
    After assembling everything I got all 6 GPU's to show up in my device manager, but 2 of them were showing a Code 43 error. After looking into this a lot I found this https://lbr.id.lv/6xgpu_mod/. If you don't
    want to click on that link, it's basically a program that will modify AMD driver configuration stored in the system registry to enable support for 6 or more GPUs. This site spoke specifically about my problem and I was
    sure that it would work. Unfortunately, after trying it several different times under several different scenarios the most I could do is get 5 GPUs to work (meaning they were mining perfectly). So at this point 1 GPU was
    still showing a Code 43 error. I have tried downloading and installing different versions of the GPU drivers that I've read on forums are best for the cards I have, but every time I try a different version number of the
    driver straight from the AMD website http://support.amd.com/en-us/download/desktop/previous?os=Windows%207%20-%2064 I always right click on the GPU's in device manager and click on properties,
    then the "Driver" tab, and see that the driver version installed is the most up to date driver instead of the older version that I installed from the link, so I don't think that's working.

I don't know if the driver version is the problem or if it's something else entirely. I have tried unplugging 1 GPU in order to verify that all 5 plugged in worked. Then plugged in the unplugged one while unplugging a different GPU and all 5 still worked. This tells me that it's not a hardware issue (like malfunctioning risers or anything). Seems like a software/configuration problem to me...and I just can't figure it out.

Below are some pictures of my setup and what I've talked about. (Not sure how to post the actual picture so you get imgur links!)

Any help would be appreciated!

Thank you,
Darcendsun




http://imgur.com/a/obqDP
http://imgur.com/a/TYep4
http://imgur.com/a/avfXq