The ASRock Fatal1ty H270 Performance comes with two PCI Express 3.0 x16 slots and four PCI Express 3.0 x1 slots.
There are also three M.2 slots: two up to 2280, supporting both PCI Express 3.0 x4 and SATA-600, and one 2230 for Wi-Fi modules.
The first PCI Express x16 slot work on x16 speed, while the second PCI Express 3.0 x16 slot works always at x4 speed.
The motherboard supports CrossFire with up to two video cards. There is no support for SLI.
The first PCI Express x16 slot is covered by a stainless steel shield, that works as a shield against interference, and also improving mechanical strength of the slot.
Figure 2: slots
Figure 3: second M.2 slot
Figure 4: third M.2 slot, for Wi-Fi cards