| Model | [TS-664-8G] QNAP TS-664 Bye-bye Gigabit NAS, hello 2.5GbE NA |
| Form Factor | Tower |
| CPU | Intel® Celeron® N5095 4-core/4-thread processor, burst up to 2.9 GHz |
| CPU Architecture | 64-bit x86 |
| Graphic Processors | Intel® UHD Graphics |
| System Memory | 8GB on board (non-expandable) |
| Maximum Memory | 8GB |
| Flash Memory | 4GB (Dual boot OS protection) |
| Drive Bay | 6 x 3.5-inch SATA 6Gb/s |
| Drive Compatibility | 3.5-inch SATA hard disk drives |
| 2.5-inch SATA solid state drives | |
| M.2 Slot | 2 x M.2 2280 PCIe Gen 3 x1 |
| 2.5 Gigabit Ethernet Port (2.5G/1G/100M) | 2 (2.5G/1G/100M/10M) |
| 5 Gigabit Ethernet Port (5G/2.5G/1G/100M) | Optional via PCIe expansion card |
| 10 Gigabit Ethernet Port | Optional via PCIe expansion card |
| PCIe Slot | 1 |
| Slot 1: PCIe Gen 3 x2 | |
| USB 2.0 port | 2 Port |
| USB 3.2 Gen 2 (10Gbps) Port | 2 x Type-A |
| HDMI Output | 1, HDMI 2.0 (up to 4096 x 2160 @ 60Hz) |
| LED Indicators | Power/Status, LAN, USB, HDD1-6 |
| Power Supply | 120W adapter |
| Dimensions (HxWxD) | 168 × 235 × 226 mm |
| Weight (Net) | 2.9 kg |