Why does my Geforce RTX3070 run beyond boost clock without overclocking?

I bought a brand new Gigabyte RTX3070 Gaming OC (Rev 1), which according to its specs has a boost core clock of 1815 MHz. A quick look into GPU-Z confirms that number, see the following screenshot:

What I’m a bit surprised about is that GPU-Z, and also the on-screen display in MSI Afterburner reports a constant clock of 1950MHz while the GPU is under load, see again a screenshot:

I haven’t done any core clock adjustments, as you can see here, for example:

How can we explain this clock difference of 125MHz? I’m using plain NVidia drivers and no overclocking.