Mirenta NS-3991 Ultra 4-Bay NAS (2.5GbE, M.2 Cache)
NAS Systems · Mirenta · SKU NS3991-ULTRA · Released 2022 · Updated 2026-10-24
Key facts
| Benchmark index | 3,592 (NAS Systems scale) |
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| Category rank | #46,013 |
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| Street price | $549 |
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| Power | 42 W |
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| Performance per dollar | 6.54 |
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| Released | 2022 |
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Specifications
| Brand | Mirenta |
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| Model | Mirenta NS-3991 Ultra |
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| Drive bays | 4× 3.5"/2.5" SATA, hot-swappable |
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| Max raw capacity | 96 TB |
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| Processor | 4-core ARM, 1.7 GHz |
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| Memory | 8 GB DDR4 |
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| Network | 2× 2.5GbE |
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| M.2 NVMe slots | 2× (cache or storage pool) |
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| PCIe expansion | None |
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| RAID | RAID 0/1/5/6/10, JBOD |
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| File system | Btrfs, ext4 |
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| USB | 2× USB 3.2 Gen 2 (10Gbps) |
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Related guides
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Cite this page: Hardware Spec Index, “Mirenta NS-3991 Ultra 4-Bay NAS (2.5GbE, M.2 Cache)”, https://vextor7.com/item/5333634 (accessed 2026-10-24).