Question about be quiet! Pure Power 12 M

Why does the PCIe 5.0 port of the 750 watt power supply say 600 watts and the PCIe 5.0 port of the 850 watt power supply say only 450 watts? Can this be correct? Or is the 850 watt power supply also equipped with 600 watts for the PCIe 5.0 connection?