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A little program of GPUs

why NO.4 card no work?

Can you check the output of the miner when you start it? (form the console). Are you sure your card is powered? (not sure if the card shows up if riser is powered)

i,m sure my card is powerd. if I install 6 cards, and only 5 cards can be show, very strange!

You flashed the vbios? A bad flash maybe?