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Asrock h570 phantom gaming 4 - Probleme with more than 2 GPU and video output

First when i boot on Windows (igpu enabled in bios) i have a video output, when i boot whith hive os no video output neither from the MB or a GPU pluged directly in…
Anyway, Hive os boot and work well with 2 GPUs, as soon as i plug a third one or a fourth … Hive os still start, miner also start i see all my gpus etc… but ONLY ONE IS MINING. I really don’t understand if anyone has an idea …

PS: Bios settings : PCIe Gen 2, Enabled 4G decoding, IGPU enabled, Bios up to date, fast boot disabled …

I have the same issue. And there is also another topic: Can't mine with third card - #11 by cryptivities

I can get only 1 GPU to work with risers on this motherboard.
Replacing it with a H 81 pro BTC and all 5 GPU’s work.

Disable CSM as Alcrowser suggest is not working.
Anyone a solution??

I just realized the memory was not supported. Will try to change it. You can se if you have the same problem. Tell you the results in some days.

Didn’t work. I have to change the mother.

You have to set GEN1 for PCIE slots.
GEN2 doesnt work on this motherboard with more than 2 GPUs
Ive also disabled SATA, with enabled sata Icouldnt see all GPUs online in Hive

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