Kestrix NS-6639 Ultra 4-Bay NAS (2.5GbE, M.2 Cache)
NAS Systems · Kestrix · SKU NS6639-ULTRA · Released 2022 · Updated 2026-10-25
Key facts
| Benchmark index | 3,551 (NAS Systems scale) |
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| Category rank | #43,459 |
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| Street price | $579 |
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| Power | 42 W |
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| Performance per dollar | 6.13 |
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| Released | 2022 |
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Specifications
| Brand | Kestrix |
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| Model | Kestrix NS-6639 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 | 4 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 | ZFS |
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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, “Kestrix NS-6639 Ultra 4-Bay NAS (2.5GbE, M.2 Cache)”, https://vextor7.com/item/2110175 (accessed 2026-10-25).