The Intel Stratix 10 E-tile Native PHY Transceiver IP in the Intel Quartus® Prime Pro edition software versions 18.1.1 and before show the supported reference clock frequency range between 125 MHz - 500 MHz.
The supported reference clock frequency range supported by the Intel® Stratix® 10 E-tile Native PHY Transceiver IP is intended to be 125 MHz to 700 MHz.