This board is really sucks. I am not able to run more than 9x vegas on that mobo. With 10x vegas, the mobo do not want to start. Only fans are spinning and nothing happend. With 9x  gpus its running well. Gpus was tested all of them, so no matter which one is connected as 10th or in which slot, its always the same.
I was in contact with asrock support and after couple of mails, they are sent me a new bios for mobo which is not on their support webpages. Unfortunatelly my rig is in remote area, so I am unable to try it.
If someone wants to try, I can send it.
Anyway is there someone who succesfully running more than 9x vegas 64 on this board?