QNAP 1U 4-Bay rackmount NAS Intel Celeron N5105/N5095 quad-core 8GB RAM onboard (not expandable) 4 x 3.5in/2.5in SATA 6Gb/s drive bays 1 x PCIe Gen3 x2 slot 2 x 2.5GbE 1 x HDMI 1.4b 2 x USB 3.2 Gen2 Type-A+ 2 x USB 2.0 2 x 250W redundant PSU with 4 x 8TB