Replacement Switching Power Supply for AIO/FLEX NAS Small 1U K39 — 400W 80plus Gold (DPS-400AB-12D / DPS-400AB-12B)

High-efficiency switching power supply designed for AIO/FLEX NAS Small 1U K39 systems. This 400W unit carries 80plus Gold efficiency and is compatible with models DPS-400AB-12D and DPS-400AB-12B. Compact 1U form factor makes it suitable as a direct replacement or spare PSU for NAS deployments that require reliable, energy-efficient power delivery.