1x SATA III (6.0 Gb/s) port for a standard 2.5-inch HDD or SSD.
The M.2 slot supports only PCIe x2 (not x4), so high-end NVMe drives get bottlenecked to ~1,500 MB/s. However, it also supports SATA M.2 drives in the same slot—something even some retail boards don't do well. A cheap 512GB SATA M.2 is the perfect speed bump for this board. acer ironman-sk motherboard specs