The problem is not in the drivers. Even before i installed the AMD blockchain drivers my system in Windows only detected 6x GPU's.
I went and changed the bios setting in the PCI configuration section from Auto to Gen1 for all 7x ports that show up and managed to get 7 out of 8 cards that i have connected now.
Again. My mining speed is very good 30Mh/s. The problem is that windows or motherboard or bios i dont know, wont show all of my cards.
I used the patcher too so no worries about that either.
Anyone else experiencing issues with this mobo?