This product is either discontinued or we cannot get that from suppliers.
QNAP TS-431XEU-2G-16TB Network Storage, CPU Architecture 32-bit ARM, Memory 2 GB SODIMM DDR3 (1 x 2 GB), Maximum 8 GB (1 x 8 GB), Slot 1 x SO-DIMM DDR3, Flash 512MB (Dual boot OS protection), Drive Bay 4 x 3.5-inch SATA 6Gb/s, 3Gb/s, 10 Gigabit Ethernet Port 1 x 10GbE SFP+, USB 3.0 port 4, 1U Rackmount, LED Indicators HDD 1-4, USB, LAN1-3, Operating temperature 0 - 40 °C (32°F - 104°F), Power Supply Unit Open-frame 100W, Input 100V-240V ~ / 3.5A, 50Hz-60Hz.
Qnap Bundle TS-431XEU-2G 4BAY NAS With Seagate 16TB (4 X 4TB) Network Storage (TS-431XEU-2G-16TB) is equipped with an Annapurna Labs, an Amazon company, Alpine AL314 quad-core 1.7 GHz ARM® Cortex-A15 processor.