Hardware Spec Index

Altrix PX-3991 Ultra M.2 NVMe to PCIe 4.0 x4 Adapter

PCIe Cards & NVMe Enclosures · Altrix · SKU PX3991-ULTRA · Released 2021 · Updated 2026-10-22

Key facts

Benchmark index1,518 (PCIe Cards & NVMe Enclosures scale)
Category rank#43,357
Street price$39
Power6 W
Performance per dollar38.92
Released2021

Specifications

BrandAltrix
ModelAltrix PX-3991 Ultra
TypeM.2 NVMe to PCIe 4.0 x4 Adapter
Host interfacePCIe 4.0 x4 (passive)
ThroughputUp to 7,500 MB/s (drive-limited)
Drive supportM.2 NVMe 2230 / 2242 / 2260 / 2280
CoolingPassive heatsink
Bus powerSlot-powered
CompatibilityUEFI boot supported; check slot bifurcation

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Cite this page: Hardware Spec Index, “Altrix PX-3991 Ultra M.2 NVMe to PCIe 4.0 x4 Adapter”, https://vextor7.com/item/1016776 (accessed 2026-10-22).