Lepzoom, you have the latest firmware, R211, so don’t worry about that.
AMD SATA chipsets seem to have all kinds of settings that can be confusing, although it may be the mother board and BIOS manufactures that make it that way. You should be in AHCI mode, given the 4K-64Thrd results, but the single 4K results are not the greatest for a SSD. What are the SATA settings in your BIOS set to?
Is that amd_sata driver from your mother board’s disk or download page, or from AMD? What mother board are you using, or what model SATA chipset does it use? You may be able to find a newer AMD AHCI driver that will perform better.
Also, when CPU power saving options are enabled, benchmark scores will be lower, the 4K results usually impacted by that. That would be AMD’s Cool and Quiet feature. You could disable that and run another test. You can also change your Windows Power Plan to High performance, which can increase scores.