QNAP TS-873AU-RP-4G NAS 8 HDD trays, 2x 2.5 GbE, rackmount, 1 PSU. 64-bit 4-core AMD V1500B 2,2 GHz, 4 GB. RAM (1*4 GB) up to 32GB (2*16 GB), 2xPSU W/o rail kit RAIL-B02