Implementing all of the extra features that belong on an RoG board on a compact Mini ITX board was a challenge, and ASUS had to come up with some clever solutions. The components for the CPU power supply, for example, have been put on a vertical PCB, and the SupremeFX sound card is also located on a separate PCB (which benefited the audio quality). Extra features such as a debug HEX display were also put on an extra little PCB between the I/O connectors. ASUS definitely achieved squeezing a large amount of features onto very little surface area.
Any major computer upgrade generally requires a full software reinstall too. No so if you heed the advice in the guide to Upgrading a Motherboard without Reinstalling. PCSTATS Tips