PCIE x16 slot 1 in Asus P8Z77-M with Sandybridge

I can't get PCIE 16x_slot1 to work on this board. I am running an i5-2550K and based on specs, the slot should support PCIE 2.0 with that CPU. The slot has power and the fans spin, but no video on any tested card in that slot. PCIE 16x_slot2 works fine, but only at 4x link speed (as expected).
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More about pcie x16 slot asus p8z77 sandybridge
  1. You are putting the GFX card in the top slot ... the PCIE-3 slot correct ?
  2. Probably a bad port. RMA the board.
  3. JackNaylorPE said:
    You are putting the GFX card in the top slot ... the PCIE-3 slot correct ?



    Hi - yes, in the top slot which is PCIE 2.0/3.0 x16 = no video
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