GPU not detected

Hi team I am pretty new when comes to mining . I have 2 Vega 56 and 2 Vega 64. I am using a gigabyte board enabled 4 g decosing. Two 56 detected but two of them are not getting detected . Gigabyte B365 gaming HD which has two slots. Using a pi + adapted to make it 1 to 4 usb and connected the cards using raisers. My mother board detected it once all 4 cards then oy three now only two. Tried changing raisers cables and even another Radeon 64 card. Please help

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