Hardware Spec Index

Caldera SN-6640 Ultra 4TB PCIe 4.0 NVMe M.2 2280 SSD

SSDs · Caldera · SKU SN6640-ULTRA · Released 2020 · Updated 2026-10-24

Key facts

Benchmark index13,262 (SSDs scale)
Category rank#48,845
Street price$489
Power6 W (active)
Performance per dollar27.12
Released2020

Specifications

BrandCaldera
ModelCaldera SN-6640 Ultra
Capacity4 TB
Form factorM.2 2280
InterfacePCIe 4.0 x4, NVMe 2.0
Sequential read4,800 MB/s
Sequential write4,000 MB/s
Random 4K read1,210K IOPS
NAND3D TLC, 218-layer
CacheDDR4 DRAM, 4 GB
Endurance2,400 TBW (0.33 DWPD)
Warranty5 years
HeatsinkHeatsink edition available

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-6640 Ultra 4TB PCIe 4.0 NVMe M.2 2280 SSD”, https://vextor7.com/item/8915115 (accessed 2026-10-24).