I have the MB problem that only 2 GPUs are recognized. When I insert the third GPU, the BIOS makes 8 beeps. It doesn’t matter which card, it doesn’t matter which PCIe slot. I always get the same error …
MB: H510 PRO BTC +
RAM: 4gb
3 GPU: Palit 3090 RTX GAMEPRO
Power: 3 x Aorus P850W
With 2 GPU in any slot it works, 3 GPU >> 8 beeps
Sorry for my English