Which slots on the ASRock Z87M Extreme4 support a graphics card at x16? I'd like to put a graphics card in the second slot and a sound card or something else in the first slot for better airflow.
The top two big ones are PCIe 3.0 x16. The bottom big one is PCIe 2.0 x16 in case you were wondering.
Put your graphics card in the top slot. It will probably block the second slot. Your sound card can go in either the third or fourth slot.