42 slot

The TPS states (I highlighted the pertinent portion): Storage. panen138 agen slot One M 2 PCIe Gen4 connector supporting M 2 22x80 (key type M) for NVMe only One M 2 connector supporting M 2 22x42 (key type B) for SATA SSD, PCIe x1 or USB 3 2 expandability One SATA 6 0 Gb/s combined data and power connector for 2 5 inch HDD