PC Tech Thread

If I was to look at buying a graphics card for it, what would you get based on this mobo's limitations:
https://www.gigabyte.com/Motherboard/GA-Z170MX-Gaming-5-rev-10/sp#sp

1 x PCI Express x16 slot, running at x16 (PCIEX16)
* For optimum performance, if only one PCI Express graphics card is to be installed, be sure to install it in the PCIEX16 slot.
1 x PCI Express x16 slot, running at x8 (PCIEX8)
* The PCIEX8 slot shares bandwidth with the PCIEX16 slot. When the PCIEX8 slot is populated, the PCIEX16 slot will operate at up to x8 mode.
1 x PCI Express x16 slot, running at x4 (PCIEX4)
1 x PCI Express x1 slot
(All of the PCI Express slots conform to PCI Express 3.0 standard.)

Multi-Graphics Technology

Support for NVIDIA® Quad-GPU SLI™ and 2-Way NVIDIA® SLI™ technologies
Support for AMD Quad-GPU CrossFireX™ and 3-Way/2-Way AMD CrossFire™ technologies