Which SATA ports can I use for RAID configuration?
You can create RAID 0, 1, 5, and 10 configurations using the Intel Z390 chipset's SATA 6 Gb/s connectors (SATA6G_1 through SATA6G_6) when the SATA Mode Selection is set to 'Intel RST Premium With Intel Optane System Acceleration (RAID)'. The PCIe x16_3 slot shares bandwidth with SATA6G_56.
From the official ASUS Asus Prime Z390 A Motherboard User manual, page 30
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