I have a 12700k and a 4090 and was planning to get the 14900k (I usually buy mid range but wanted this just so I could have the fastest intel cpu for once in my life). Recently though I have decided on the 14700k since it seems almost as good as the 14900k at 1440p based on the few 1440p reviews I could find. Most reviews are based on 1080p which I understand why but if you never use 1080p it is not helpful. Regarding how you saw an improvement, could you respond with what resolution you saw an improvement? I found your comments helpful but if it is at 1440p it would be really helpful. Thanks
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.