5.25Ghz is the max boost frequency. However MSI AB, which is what I use for my overlay due to low cpu footprint, shows the requested clock frequency not the actual clock frequency. Currently only two apps, HWINFO64 and Ryzen Master Tool show the actual (effective) clock speeds which show a more accurate true clock speed. Effective clock speed in games is lower than the requested clock speed. See a video I recorded earlier on BF2042 showing the effective clock speed from Ryzen Master Tool.
MSI AB cannot also accurately poll a sleeping Ryzen core, so all it does is show the last requested clock state for a core, which is almost always inaccurate. This often makes it look like a game is using all the cpu cores due to what is shown on my MSI AB overlay. However, the video above shows that is not always the case as you can see 6 of the 8 cores are actually asleep on the second CCD. When I ran BF2042 in that earlier video, you’d think all cores were awake and in use. So in short, don’t get hung up on the reported clock speed too much based on the MSI AB overlay.