Halcyra NS-3991 Pro 2-Bay NAS (2.5GbE)
NAS Systems · Halcyra · SKU NS3991-PRO · Released 2025 · Updated 2026-10-21
Key facts
| Benchmark index | 3,206 (NAS Systems scale) |
|---|
| Category rank | #48,729 |
|---|
| Street price | $469 |
|---|
| Power | 29 W |
|---|
| Performance per dollar | 6.84 |
|---|
| Released | 2025 |
|---|
Specifications
| Brand | Halcyra |
|---|
| Model | Halcyra NS-3991 Pro |
|---|
| Drive bays | 2× 3.5"/2.5" SATA, hot-swappable |
|---|
| Max raw capacity | 56 TB |
|---|
| Processor | 4-core ARM, 1.7 GHz |
|---|
| Memory | 8 GB DDR4 |
|---|
| Network | 2× 2.5GbE |
|---|
| M.2 NVMe slots | None |
|---|
| PCIe expansion | None |
|---|
| RAID | RAID 0/1, JBOD |
|---|
| File system | Btrfs, ext4 |
|---|
| USB | 2× USB 3.2 Gen 2 (10Gbps) |
|---|
Related guides
Similar NAS Systems
| Model | Benchmark | Price | Compare |
|---|
| Kestrix NS-2764 Ti 2-Bay NAS (2.5GbE) | 1,730 | $179 | Compare |
| Mirenta NS-3487 Plus 4-Bay NAS (1GbE, M.2 Cache) | 3,661 | $549 | Compare |
| Mirenta NS-5658 Max 2-Bay NAS (1GbE) | 2,404 | $299 | Compare |
| Kestrix NS-1288 Max 4-Bay NAS (2.5GbE, M.2 Cache) | 4,599 | $1,039 | Compare |
| Novexa NS-5712 Ultra 6-Bay NAS (10GbE, M.2 Cache) | 6,308 | $2,069 | Compare |
| Kestrix NS-6907 Edge 8-Bay NAS (10GbE, M.2 Cache) | 6,370 | $1,959 | Compare |
All NAS Systems · JSON
Cite this page: Hardware Spec Index, “Halcyra NS-3991 Pro 2-Bay NAS (2.5GbE)”, https://vextor7.com/item/2013863 (accessed 2026-10-21).