The ASUS ROG Apex line of boards have always been known for its focus on overclocking as well as unique design implementations like the “X” shaped board and the unique ‘DIMM.2’ slot – a DRAM-like slot for a bundled add-in card that can be used for two additional M.2 modules on a PCIe 3.0 x8 link. The Z370 ROG Maximus X Apex sticks with its pedigree and even adds a 5G network port to a long feature list. 

Source: AnandTech – The ASUS ROG Maximus X Apex Review: X Marks the Spot, Literally