Hardware Spec Index

Caldera SN-4638 Ultra 4TB PCIe 3.0 NVMe M.2 2280 SSD

SSDs · Caldera · SKU SN4638-ULTRA · Released 2019 · Updated 2026-10-20

Key facts

Benchmark index13,533 (SSDs scale)
Category rank#40,174
Street price$479
Power4 W (active)
Performance per dollar28.25
Released2019

Specifications

BrandCaldera
ModelCaldera SN-4638 Ultra
Capacity4 TB
Form factorM.2 2280
InterfacePCIe 3.0 x4, NVMe 1.4
Sequential read3,300 MB/s
Sequential write2,600 MB/s
Random 4K read400K IOPS
NAND3D TLC, 238-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-4638 Ultra 4TB PCIe 3.0 NVMe M.2 2280 SSD”, https://vextor7.com/item/43668139 (accessed 2026-10-20).