The ASRock 4X4 BOX-7840U offers near-class-leading number-crunching capabilities while consuming less power than its direct competition. Additionally, it is easier to work on and upgrade, making it a well-rounded system for a home office, casual gaming, or emulation.
4k30Hz HDMI in 2023 is just pathetic. The USB-C ports on the front are capable of carrying more display bandwidth than that.
EDIT: Sounds like it might have been a typo in the spec sheet; reviewer reports that 4k60 worked fine.