MatErGodt :
Ehm, I don't know if you're gonna see this, since it is a long time since I've said anything here... But on this video: https://www.youtube.com/watch?v=ms03AdoaHgo&t= at 13:50 he is saying that it is only 2 usb 2.0 headers....
At exactly 13:52 he mentioned the 2x USB 2.0 Headers, right? Now what he
FAILED to mentioned is that in 13:29, when he showed the ROG_EXT headers, the right side set of pins of that ROG_EXT
is ANOTHER USB 2.0 Header. So that brings the total of
2x USB 2.0 Headers (the ones with the black frames shown in 13:52 of the video)
plus 1x USB 2.0 (as part of the ROG_EXT headers shown in 13:29 of the video).
Total = 3x USB 2.0 Headers.
If you still don't believe me, check the actual specifications and manual at the Asus website: https://www.asus.com/us/Motherboards/ROG-STRIX-Z270E-GAMING/specifications/
Internal I/O Ports:
3 x USB 2.0 connector(s) support(s) additional 6 USB 2.0 port(s)
In Page xi of the manual: https://www.asus.com/us/Motherboards/ROG-STRIX-Z270E-GAMING/HelpDesk_Manual/
Internal I/O Ports:
3 x USB 2.0 connectors support additional 6 x USB 2.0 ports (one connector via ROG_EXT header)
You can also check Page 1-15 of the manual and you'll see the actual diagrams and pin-outs of these 3 USB2.0 headers I'm telling you. Here's an actual photo to give you a better look at what I'm saying:
See that ROG_EXT (which consists of 2 sets of pins, at the left is an 8pin and at the right is a 10-1pin)? Well, that 10-1 pin and label "USB1314" below -- that's your additional USB2.0 header (apart from the "USB910" and "USB1112" the guy in the video told you).