The TS-873 is powered by a high-performance and low-power AMD R-series CPU and features two PCIe expansion slots for adding even more features. Adding an M.2 SSD to the two built-in M.2 SATA SSD slots can greatly boost NAS performance with SSD caching and Qtier auto-tiering.- Model number TS-873 (QNAP model number TS-873-4G) CPUs AMD R-Series RX-421ND Quad Core 2.1 GHz (up to 3.4 GHz Turbo Core) Architecture 64-bit Encryption engine AES-NI Memory slots 4 x DDR4 SODIMM Typical 4GB (2 x 2GB), Max 64GB (4 x 16GB) * Cannot be used in combination with different capacities of memory. flash 512MB DOM Drive Bay 8 x 3.5”/2.5” SATA 6Gb/s HDD/SSD Hot swappable M.2 SSD slot 2 x M.2 2260/2280 SATA 6Gb/s SSD *M.2 SSD is optional. We recommend using a heatsink. LAN port Standard 4 x 1GbE (RJ-45) : Optional: 10GbE (RJ-45, SFP+) USB port Front 1 x USB 3.2 Gen.1 (Type-A, USB one-touch copy button) Rear 3 x USB 3.2 Gen.1 (Type-A) PCIe expansion slots 2 x PCIe Gen.3 x4 * Supports full-size 10GbE LAN card, USB 3.1 Gen.2 (10Gb/s) expansion card, QM2 card, PCIe wireless network card or bus-powered graphics card. Audio input/output 2 x 3.5mm dynamic microphone input jacks 1 x 3.5mm line-out jack 1 x speaker * The speaker and line output jacks cannot be used at the same time. *From January 2021, audio input/output terminals and speakers will not be installed. LED indicator system status Power, USB, LAN, Drives 1-8, M.2 SSD 1-2 Buttons Power, Reset, USB One Touch Copy Security Design Kensington lock compatible External size 188 188 (H) x 329 (W) x 280 (D) mm Weight Main unit weight Main unit weight 6.59 kg (without HDD) Power supply unit Input 100-240V AC 50-60Hz, Output 250W * The included power cable is for 100V. Please prepare separately when using at 200V. Power Consumption 35.11 W during HDD sleep, 63.69 W during normal operation (with 2TB HDD fully installed) Fans System 2 x 12cm CPU 1 x 6cm Operating ambient temperature 0 - 40℃ Operating Ambient Humidity 5 - 95% (non-condensing), wet bulb temperature 27°C Noise level 23.4dB(A) Included Items NAS main unit, LAN cable (RJ-45) x 2, power cable, screws for 2.5 inch drives x 24, screws for M.2 SSD x 2, heat sink for M.2 SSD x 2, quick installation guide< /td> Warranty period 2 years for stand-alone models, 5 years for near-line class models with HDD, 3 years for middle class