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What can cause a GPU to stop working + reboot system?
I've fiiinallly managed to get my rig online with 4 GPUs 
However, I've noticed that GPU2 will (after 5min) stop hashing and then within 2-3 minutes the system will reboot and bring it back online... then 5mins later it stops hashing and within minutes a system reboot again... it's a forever loop.
I saw the gpu working when I bought it so i know it's not faulty and I've re-applied the thermal paste and tried it again but it's not really made any difference.
My PSU's are 1000w each (x2) and with all 4 GPUs running they are running at 50% each so it's not a power load problem for sure.
I'm using the latest VER 008S powered risers and they are powered using 6pin direct from PSU.
However, I've noticed that GPU2 will (after 5min) stop hashing and then within 2-3 minutes the system will reboot and bring it back online... then 5mins later it stops hashing and within minutes a system reboot again... it's a forever loop.
I saw the gpu working when I bought it so i know it's not faulty and I've re-applied the thermal paste and tried it again but it's not really made any difference.
My PSU's are 1000w each (x2) and with all 4 GPUs running they are running at 50% each so it's not a power load problem for sure.
I'm using the latest VER 008S powered risers and they are powered using 6pin direct from PSU.
Answers