I bought another motherboard in order to separate AMD and Nvidia but on the second mobo I can only run 2 GPUs at the time and if I plug one of the two on the first 16x slot it won’t boot at all and it will do the same if I plug a 3rd 4th or 5th card the new rig consists of :
mobo h470 asrock phantom gaming 4
CPU g5900
ram 8Gb
Do you have booting problems on the Nvidia, or the AMD rig?
You use the same mobo for both rigs, if yes, did you set up the bios correctly?
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