And, since PCIe x1 and M.2 Key-E share a lane, using one of those interfaces excludes using the other. In that configuration, the only remaining expansion slots are the PCIe x1 and M.2 Key-E slot. And remember what we said about 28-lane CPUs requiring the top x16 slot to host ASRock’s Ultra Quad M.2 Card? Moving a single graphics card to the second x16 slot will also effectively block the bottom x16-length slot. Due to the thickness of most graphics-card coolers, CrossFire and SLI users will typically find the third x16-length slot inaccessible. While the audio-header placement is beneficial to those whose cables might otherwise come up a little short, pushing a graphics-card slot southward while maintaining three slots of separation (for improved graphics cooling) means that the second PCIe x16 slot aligns to the case’s sixth position. Layout oddities include a top PCIe x16 slot that aligns to the case’s third expansion slot, and a front-panel audio connector that’s pushed forward from the traditional corner by about an inch.
This also makes sense, since each header serves two ports, and most cases have only two USB 3.0 front-panel ports. While expensive boards typically preserve I/O resources by using a hub for some of their USB 3.0 ports, ASRock gets around that problem by not having a second USB 3.0 front-panel header. The way to make both work is have one display through docker's thunderbolt 3, and another through laptop's HDMI port or USB-C port, a note that not all laptop support display through USB-C, CLEVO P751TM1 doesn't support it, it should either be HDMI or mini DP port.
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