Hello, I have bought a Z77A-GD55 with the exact same problem. After searching on this forum and many others, here is what I have done and found out.
I have bought a Gigabyte TP Link 3468 PCIe 32 bits network card in order to "cowardly avoid the problem...
I have bought a Gigabyte TP Link 3468 PCIe 32 bits network card in order to "cowardly avoid the problem...