Quote from: KevinUK on July 12, 2017, 06:37:07 PM

Quote from: hcwh on July 12, 2017, 07:58:38 AM

Quote from: KevinUK on July 11, 2017, 09:46:43 AM

Hi,

I have 7 x Nvidia GTX 1070 with this motherboard and have it running with 6 fine (not overclocking yet).

I am using an M.2. SSD and have 5 cards and 6 USB risers on a 1000W PSU and 2 cards and the M.2. SSD on a 500W PSU.

Sometimes when I reboot one of the cards fails to load (in device manager):

Quote

Windows has stopped this device because it has reported problems. (Code 43)

If I disable / enable the device then it works again.

I have run Display Driver Uninstaller then re-installed the Nvidia drivers but this does not help.

I have swapped the USB cable riser around and used different 3d cards, the hardware is all fine.

Any advice?

To get 8 GPU working in Windows 7, you need to make some changes to the registry to address the code 43 warning. Problem I had is when I went down to 7 GPUs and back up to 8, the registry hack no longer worked. I didn't spend too much more time on it before switching to Linux which doesn't have that problem. Check out the NVIDIA forum post below and try that and it may help. Supposedly not necessary for Windows 10.

https://devtalk.nvidia.com/default/topic/738070/cuda-setup-and-installation/8x-gpu-gtx-issue-under-windows/post/4208565/#4208565

I'm on Windows 10 but tried anyway, it didn't work though. I can occasionally get 7 cards to show without errors but even then I mostly get the error:

CUDA error - cannot allocate big buffer for DAG. Check readme.txt for possible solutions.

I've had it working perfectly with 7 cards a couple of times. Maybe it's time to try SMOS Huh

The "Cannot allocate big buffer for DAG error...." could also be because you haven't increased the Virtual Memory to 16GB