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Question (448): The system cannot recognize one of my graphics cards. What should I do?(9/1/2017)

Question: The system cannot recognize one of my graphics cards. What should I do?(9/1/2017)

Answer:
If some graphics cards are not recognized by the system, it is not necessarily related to only the motherboard but also to other components. The riser cards, power supply, graphics cards and even the OS are all key points for the system. Please refer to the following three parts to check your system.
(A) The PCIe riser card
1. Please double check if the graphics cards are installed properly on the riser cards. Or take the graphics cards off the riser cards and install them on the riser cards again.
2. We recommend choosing PCIe riser cards with 6-pin power for the mining system.

3. If you are using PCIe riser cards with a Molex connector, please use maximum two Molex connectors on each power cable. Not more.

(B) Power supply
When using (close to) 13 graphics cards, you will probably have to use 2 power supplies. Normally the power supply will provide 12V, 5V and 3.3V power to the motherboard.
But in a mining system with multiple power supplies the situation is different. The first power supply has to be connected to the motherboard (12V, 5V and 3.3V) and some of the graphics cards (12V). The second power supply should only be connected to some graphics cards (12V). Because the second power supply will only supply 12V voltage to the graphic cards, it can cause power loading imbalance.
Power supply vendors suggest users to use only one power supply per system.

(C) Graphics cards
1. The single GPU systems typically draw about 200W, the system will need adequate power for whole system. Please double check if the system power is enough for the whole system.
2. Please install one graphics card and make sure it can be recognized under device manager.
If it is not, please shut down the system and press the power button to boot the system again. Then wait for the system to detect the device.
3. If it is not detected please clean the golden finger of the graphics card with a rubber (pencil eraser) and reinstall the card.