Not quite correct .
Radeon Plolaris RX550 & Rx560 video cards will work but there is no driver on the AmigaOS4.1 FE CD.
In order to install without another working AmigaOS 4.1 system the user would have to boot and install with another video card that has a supported driver on the AmigaOS4.1 FE CD. A Radeon HD5450 for example .
Then install the purchased Radeon RX driver. And then install the Radeon RX video card .
What might be hardener to find are working supported PCIex1 audio cards unless a driver update is done for the CMI8738 card which certain version cause a lockup . PCIex1 Envyht24 based cards are scarce .
The SIL3114 and SIL3112 PCI SATA cards are readily available. Not so the Sil3512 which is the most compatible .
I also doubt videocards are available from stock in places like Amazon that would work with the Sam460.