How to turn off Server PSU when motherboard shutoff? Almost fried my GPUs

[equasar]

My rig have this setup:
 - ATX PSU: Powers motherboard and 3 GPUs
 - Server PSU: Powers up 5 GPUs using breakout board from DeepInTheMines (soon to be replaced with a ParallelMiner Rev8)
 - GPUs: 8x Vegas 56

I followed the recommended procedure to connect the risers to the PSU where the GPU is connected.

Today I woke up and noticed that my rig was shutdown for unknown reason, so the ATX wasn't powering anything but the Server PSU with the breakout board was still on and so the GPUs, but the fans were not spinning. According to the logs of the miner, it was like that for around 1hr. I touched the GPUs and they were pretty hot, around 75°C maybe.

I want to prevent this but not sure how it is possible having an ATX and Server PSU. I know you can bridge two PSU, so when one shutoff the other too, but to my understanding that's only with ATX PSUs.

Does anyone knows how I can prevent this scenario again? I don't want to fried my GPUs when I need to leave my rig unattended for days (which is something I'll do in a week).

[Turkish88]

How you run server psu. I think you connect 2 or 3 contacts. Most server psu runs when connecting ps on and pskill with ground.
You must need connect pskill to the green atx wire and gnd to any black wire on atx psu, then when your atx psu shutdown he followed switch off server psu

[Moondoggie]

My rig have this setup:
 - ATX PSU: Powers motherboard and 3 GPUs
 - Server PSU: Powers up 5 GPUs using breakout board from DeepInTheMines (soon to be replaced with a ParallelMiner Rev8)
 - GPUs: 8x Vegas 56

I followed the recommended procedure to connect the risers to the PSU where the GPU is connected.

Today I woke up and noticed that my rig was shutdown for unknown reason, so the ATX wasn't powering anything but the Server PSU with the breakout board was still on and so the GPUs, but the fans were not spinning. According to the logs of the miner, it was like that for around 1hr. I touched the GPUs and they were pretty hot, around 75°C maybe.

I want to prevent this but not sure how it is possible having an ATX and Server PSU. I know you can bridge two PSU, so when one shutoff the other too, but to my understanding that's only with ATX PSUs.

Does anyone knows how I can prevent this scenario again? I don't want to fried my GPUs when I need to leave my rig unattended for days (which is something I'll do in a week).

Weird. When my motherboard is off, all my cards remain running, but the fans spin still

[equasar]

I resolved this issue connecting the ATX power supply with the 4 pin in the breakout board.

[michnern]

I resolved this issue connecting the ATX power supply with the 4 pin in the breakout board.

Which breakout board are you using and how did you link it to your ATX power supply? Is there a 4 pin connector on the breakout board or did you physically connect a wire to pin # 4? If so, which pin on the ATX side? A picture would be great if you have one . Thanks!

[kyogi14]

I'm interested in this also.  Some models of the breakout have a 4pin header that allows you to signal when to turn on from an atx supply. I have no such header on my breakouts but would like to mod them if possible to have this "sense" capability.