QNAP Systems has launched the TS-x73 NAS series of efficient, high-performance models with 4 TS-473, 6 (TS-673) and 8 trays (TS-873). The new range uses an AMD RX-421ND quad-core processor with Turbo Core up to 3.4GHz and offers two PCIe expansion slots to install QNAP QM2 cards, wireless network cards or a video card.