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RE: Optiplex 7010 SFF no POST when network adapter in PCI-E x4 slot

The 390 does not have PCI-E 3.0 slots.  There is an inherent incompatibility with PCI-E 3.0 and older versions of cards.   This is because the power profile AND the clock speed of the bus does not DOWNGRADE to 1.0 or 2.0  speed.   If you need 802.11 Dual band use a USB Wifi Adapter like the

EIDEMAX AC600 usb adapter.

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