GamersNexus have a video on the VRMs in the Asus Hero board, interesting it he points out the 2 phase VRMs for memory. From what I can see this board and the TaiChi are the only ones that are 2 phase, possibly explaining why they seem to be the best with regards to memory speed?
https://www.youtube.com/watch?v=3xfLYLRsPZ0
https://www.youtube.com/watch?v=3xfLYLRsPZ0