MSI is apparently prepping a new BIOS for select MAG motherboards, which would enable base clock (BCLK) overclocking on the Ryzen 7 5800X3D. This is significant since AMD ships the CPU - its fastest gaming processor to date - with a locked multiplier. According to a WCCFTech report, BIOS 1H1 can enable up to 7 percent gains in single-threaded workloads. Considering that the Ryzen 7 5800X3D already trades blows with the Alder Lake i9-12900K across a range of games, this could be enough to proper the 5800X3D to the top.
It's important to note one key factor here: MSI's BIOS update enabled BCLK overclocking here - increasing the base clock will impact all components connected to your motherboard, including your GPU and storage. As compared to standard multiplier overclocks, BCLK overclocks can introduce a substantially greater amount of instability since you're overclocking so many other components apart from the CPU.
Your mileage will vary, and as it stands, MSI only looks to be unlocking this functionality on their premium MEG motherboards. It remains to be seen whether BCLK overclocks become a reality on cheaper X70 platforms like the MSI X570 Tomahawk.
Check out the MSI MEG X570 Unify here on Amazon.