Well damn, this is what the online manual for the board I'm looking at says
ASRock XFast Charger is the best and fastest technology to charge your mobile
devices via PC. With the superb XFast Charger USB port, users are assured to enjoy the quick charging experience anytime. In addition to Apple devices, it is also capable of Charging the BC 1.1 standard smart devices. Please refer to below instruction for proper operation.
I noticed the Apple or BC 1.1 standard devices only, I googled BC 1.1 and it doesn't look like my EVO's one of them 🙁 From reading about BC 1.1 and fast charging USB on XDA it appears it's not that great any ways, but I can't find any concrete numbers on the speed difference.
thanks for the reply & link, I definitely didn't see that when I was on ASRock's web site.