Quote from: OhHaiAndy on June 15, 2018, 11:39:35 PM

Quote from: drale on June 15, 2018, 10:28:08 PM

Quote from: OhHaiAndy on June 15, 2018, 09:59:30 PM

Quote from: drale on June 15, 2018, 07:15:19 PM

I have new information.

It is not problem with risers at all. When I unplug any GPU, rig works perfect. So rig works perfect with 5 GPUs.
Perhaps problem is with voltage or something else.

What should I do?

Every time I have had issues like this it was due to using an insufficient PSU. You can get a very inexpsensive 500-750w PSU + a dual PSU connector and give that a shot. Likely will get you running.

Is it possible? Rig was working perfectly more than 6 months with same PSU. That PSU is on rig right now, no changes.

If they are running at full power, then that's right at the max capacity for a 1200w PSU. If they are running at lower wattage, then it should be fine. Have you swapped the PSU out with another 1200w and tried that? I have had rigs with reboot issues because of insufficient PSUs and I've had reboot issues because the PSU was dying.

If the issue isn't the riser, but removing a GPU and it's load from the system makes the rig stable, it sounds like a power issue to me, but of course there are lots of possibilities and variables.

Is there some software or some other way to test PSU?