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Quote from: maxrena on December 13, 2016, 04:53:50 PM

Hello guys,
I have a problem when mining. I am using Claymore miner and 6 RX 480 GPUs.
My problem is, there will be 1 GPU not recognized or something like that.
Let's make an example like: when I have 6 GPUs, GPU 3 will be mining at 0 H/s, and the console says: "GPU 3 hangs when OpenCL calls, exit".
when I have 5 GPUs, one of them will behave the same, which means, GPU x will be mining at 0 H/s, "GPU x hangs when OpenCL calls, exit".
I follow all the settings, put in necessary command lines, etc.
I used to reboot until my rig let all the GPUs work, but now that way is not working anymore.
Please help.

well there are various things to try/check....

first let us know what components you are using (mobo, ram, PSU, CPU, Win7/8/10) and what settings for the GPU (OC, voltage??)

from the first shoot i would gues low virtual mem (have to be 16gb min.) or too much OC/undervolt ( as many wrote that this is the main problem by the "hanging" of the GPU)..

I forgot about my components:
Mobo: Biostar TB85
CPU: Intel Celeron G1840 2.8Ghz
PSU: 2 x 750W
OS: window 10 enterprise

About paging memory, I first tried to set it up to 16GB, but now I set it to even 30~40GB, still no help, and I dont even OC it.

well i would gues:

1, try to change the gpu 3 (the GPU which is hanging and loosing the hash rate to 0h/s) to the main port and plug the monitor to it, or use an dummy plug...

2, bad GPU riser (hope you are powering the risers with the molex directly to the PSU, the sata cables are dangerous and it doesnt deliver enough power to the riser which could cause the hanging..)

3, something wrong with the GPU... I would try to set up the rig with 1 gpu, if it works then add next one and try with 2 GPUs, if it works then add next one and try it with 3 until you find out which one is causing
the problem.. It will take some time, but this way you can see with how much GPUs max is your rig running normal, where is the limit...)

4, dont know the mobo - so maybee it is not able to handle 6 GPUs (really dont know, try to search if some1 experienced to get it work, the mobo, with 6 gpus)

dont have any amd RX, but check also here on forum what driver to use, as im using the 15.12 driver but this one is not the right one for the RX GPUs...

Hope it helps.... GL

Thank you for your advice,
Anything related to physical touch up, like, try another riser, switch GPU, plug 1 by 1, etc, I tried them all.
About GPU, I dont think that the GPU problem. You know, it's not about GPU 3 or the power, my case is like I described before
When I plug 6 GPUs in, GPU 3 will hang.
When I plug 5 GPUs in, GPU x will hang.
There will be always 1 GPU hanging, no matter how many GPUs I plug in.

always same port? maybee the port on the mobo is bad... (if it is the same port..)

No, when I have 5 GPUs in, that means I take that GPU 3 out, just left 5 on the rig, at that time, another GPU will hang.

ok i did a small research, obviusly you are not the only one with this problem.

Most ppl had the problem when it was OC, but you said you are using stock settings....

Next if the GPU hangs is there any change in the device manager? Are all 6 GPUs recognized by the system and device manager?

Also did you tryied the 6 gpu setting, and after it hangs put a dummy or a monitor to the "hanged" gpu? does it changed after miner restart?

Yes, Im using stock settings, Device manager show all 6 GPUs are recognized.
eh, about the tried 6 GPus setting, put dummy or a monitor things, I dont have those kind of things to monitor GPU. Im using MSI afterburner to take care of fan speed, but I thought mb it is the reason, I tried to turn off the Afterburner, but no help.

hopely this will help you, if all your hardware don't have a problem from PSU,cable, and riser, instal the lastest driver ( in my experience for multiple GPU wait until finish all instal the driver), restart, and run MAB set default for all setting accept fan speed as you needed at your temp room, and then run claymore v.9.1. If still get hang try setting your intensity one by one from 5, 6,7 or 8.