Post a screenshot of Ryzen Master Advanced View showing the 5700X at 1.45V
The 5700X is a 65W TDP processor with a stock PPT of 76W - it hits that PPT limit very quickly, as low as 4.2-4.3GHz on an all-core workload.
Have non-default motherboard BIOS changes or RM settings been made?
Ryzen R7 5700X | B550 Gaming X | 2x16GB G.Skill 3600 | Radeon RX 7900XT
Ryzen R7 5700G | B550 Gaming X | 2x8GB G.Skill 4000 | Radeon Vega 8 IGP
Ryzen R5 5600 | B550 Gaming Edge | 4x8GB G.Skill 3600 | Radeon RX 6800XT