I tested ArcaOS on an AMD A6 processor (8 GB, UEFI). AHCI works as it should, and ArcaOS installed with no trouble. I also tested on older quad core, and triple core, AMD processors (2 to 6 GB). AHCI always worked as expected. I do know that you had AHCI problems in the past, and I expect that whatever that was is also causing your problems now. Be sure that you have it set to use AHCI. It may also help if you deselect the Dani driver in the preboot menu, unless you need it for something. If you do need it, driver load order may make a difference (edit CONFIG.SYS, if needed).