QNAP TS-473 Diskless 4-bay NAS/iSCSI IP-SAN AMD RX-421ND 2.1~3.4 GHz, 4GB DDR4 RAM, 4x 2.5"/3.5" + 2x M.2 2280/2260 SATA 6Gb/s drives, 4x GbE LAN, optional 10GbE PCIe expansion. Inclusive of NASBIT.

TS-473-4G 

CPU Processor: AMD R-Series RX-421ND quad-core 2.1 GHz processor, Turbo Core up to 3.4 GHz
Architecture: 64-bit
Encryption Engine: AES-NI
System Memory 4 GB DDR4 (2 x 2 GB)
Maximum Memory 64 GB (4 x 16 GB)
Memory Slot 4 x SODIMM DDR4
(For dual- or quad-DIMM configurations, you must use a pair of identical DDR4 modules.)
Flash Memory 512MB DOM
Drive Bay 4 x SATA 6 Gbps
Drive Compatibility • 3.5-inch SATA hard disk drives
• 2.5-inch SATA hard disk drives
• 2.5-inch SATA solid state drives
M.2 SSD Slot 2 x M.2 2260/2280 SATA 6Gb/s SSDs (Sold separately)

Note:
1. The M.2 SSD is not included as standard.
2. M.2 SSD operations can easily generate excessive heat. It is recommended to install a heatsink (from QNAP or a third-party provider) on the M.2 SSD.
SSD Cache Acceleration Support • Drive bays 1 to 4
• M.2 slots 1 to 2
• Optional: M.2 SSD using QNAP QM2 PCIe expansion card
Hot-swappable
The following are not hot-swappable: M.2 SSDs, SSD cache drives, SSDs using PCIe expansion slots.
Gigabit Ethernet Port 4 x RJ45
PCIe Slot 2 x PCIe 3.0 x4
Note: Support low-profile 10GbE LAN card, USB 3.1 Gen2 (10Gb/s) expansion card, QM2 card, PCIe wireless network card or a bus-powered graphics card.
USB Port 4 x USB 3.0 (Front: 1; Back: 3)
Audio • 2 x 3.5 mm dynamic microphone jacks
• 1 x 3.5 mm line-out jack
• 1 x speakers

Note: You cannot use the speakers and the line-out jack simultaneously.
USB One Touch Copy Front: USB 3.0
IR sensor Optional QNAP RM-IR004 remote control (MCE compatible)
Form Factor Tower
Dimensions (H x W x D) 188.2 x 199.3 x 279.6 mm
7.41 x 7.85 x 11.01 inch
Power Consumption (W) HDD standby: 33.24 W
In operation: 56.23 W
(with 4 x 2TB HDDs installed)
Sound Level Sound pressure (LpAm): 21.7 dB(A)
Net Weight 4.84 kg (10.67 lbs)
Power Supply Unit 250W, 100-240V AC, 50/60Hz
Fan System: 1 x 120 mm
CPU: 1 x 60 mm
Operating Temperature & Relative Humidity 0 ~ 40˚C ( 32˚F ~ 104˚F ), 5 ~ 95% RH non-condensing, wet bulb: 27˚C (80.6˚F)
Security Slot Kensington security slot

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    QNAP TS-473-4G Diskless Professional-grade 4-bay NAS

    Your Custom Configuration:
    • No Hard Drive
    • No RAID
    • No RAM Upgrade
    • No RAIL
    • No Network Card
    • No Warranty
    • No SSD Cache