I will just comment on the power side since I looked into it recently. It appears to be one of the higher end msi boards, If I am understanding it correctly that msi board has 90 amp phases which is pretty high. Other z790 boards I have looked at have 60 amp phases but even those can handle a 14900k based on their website. So the msi board can definitely handle a 14900k from a power standpoint. Hope this helps.
I will just comment on the power side since I looked into it recently. It appears to be one of the higher end msi boards, If I am understanding it correctly that msi board has 90 amp phases which is pretty high. Other z790 boards I have looked at have 60 amp phases but even those can handle a 14900k based on their website. So the msi board can definitely handle a 14900k from a power standpoint. Hope this helps.