I had simillar prob with DH77DF, Initially PCIex1 cards were not coming up, then I looked into the communities and found that Intel has a BIOS update for this issue and I took the BIOS update which is latest by May 2013 and PCIex1 cards started working, but I am surprised when I inserted a PCIeX4 card, this card is not detected, does it mean the BIOS update is only for 1 Lane? or do u have another fix for PCIEex4, does any one has any idea, or can anyone from Intel answer this?
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