Hardware Spec Index

Caldera SN-6491 Ultra 4TB PCIe 4.0 NVMe M.2 2280 SSD

SSDs · Caldera · SKU SN6491-ULTRA · Released 2021 · Updated 2026-10-20

Key facts

Benchmark index12,020 (SSDs scale)
Category rank#38,306
Street price$349
Power8 W (active)
Performance per dollar34.44
Released2021

Specifications

BrandCaldera
ModelCaldera SN-6491 Ultra
Capacity4 TB
Form factorM.2 2280
InterfacePCIe 4.0 x4, NVMe 2.0
Sequential read6,100 MB/s
Sequential write4,600 MB/s
Random 4K read880K IOPS
NAND3D TLC, 232-layer
CacheDDR4 DRAM, 4 GB
Endurance2,400 TBW (0.33 DWPD)
Warranty5 years
HeatsinkNone

Related guides

NVMe SSDs ExplainedM.2 SSD Sizes and KeysSSD Endurance ExplainedDRAM vs DRAM-less SSDsPCIe 4.0 vs PCIe 5.0

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Cite this page: Hardware Spec Index, “Caldera SN-6491 Ultra 4TB PCIe 4.0 NVMe M.2 2280 SSD”, https://vextor7.com/item/7529239 (accessed 2026-10-20).