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HELP! for Radeon RX 6800 (Rig crashes with 2 cards and not 1)

First time writing here so would really love if someone can help me out on my mining journey.

I just setup my rig yesterday and the issue is that it works fine with one GPU but as soon as I install the second GPU and run it ,it runs fine for the first 3 mins and then the rig crashes and the motherboard rests itself in a cyclic fashion. It runs perfectly fine with one GPU on it. Could this be a faulty PSU or a motherboard ? The overclocking setting are the popular presets on HiveOS and the core temperature never goes above 55 degree C.

Here are my rig specs:
2 X AMD Radeon RX 6800


Z490-A PRO (MS-7C75) Micro-Star International Co., Ltd.


2 × Intel® Celeron® G5925 CPU @ 3.60GHz AES

Disk Model

USB SanDisk 3.2Gen1 30.8GB


8 GB

Power supply?

Overclocking 6800s are wide ranging and you can easily be pushing the max. The numbers put in the GUI are not aways what is set in the actual GPU.

  • What settings are you trying to use.

What actually crashes? The miner software? The OS? The ?

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