Delta DPS-250AB-44J 320W Power Supply — Replacement for DPS-250AB-44D in NAS and Compact Systems

A higher-capacity drop-in replacement for the Delta DPS-250AB-44D.

The Delta DPS-250AB-44J is a 320W compact power supply listed as a replacement for the DPS-250AB-44D. It uses the same Flex/1U-style housing, provides ATX, SATA and 4-pin CPU connectors and accepts 100–240V AC input. It suits NAS units, compact servers and small systems needing extra power headroom.

Extra Headroom in the Same Compact Footprint

Compact NAS units and small servers often run close to their power supply’s limit, especially when all drive bays are populated. Running near maximum load raises heat and shortens power supply life.

The DPS-250AB-44J fits the same space as the 250W DPS-250AB-44D but is rated at 320W. Installing it gives the system more margin for drive spin-up and continuous operation without changing the chassis.

Direct Replacement Fit

The housing, mounting points and connector layout follow the DPS-250AB-44D design, so the unit installs in the same position and connects to existing cables.

Connectors for Motherboard, CPU and Drives

ATX main power, a 4-pin CPU connector and SATA power cover the board and drives in compatible systems. An integrated fan provides cooling inside small enclosures.

Setup Instructions

How to Replace a DPS-250AB-44D With the DPS-250AB-44J

1. Shut down the NAS or compact system, unplug the AC cord and press the power button for a few seconds to drain residual power.
2. Open the side panel, photograph the cable routing, then disconnect the power cables from the motherboard, drives and any graphics card.
3. Remove the mounting screws or release latch, take out the old unit and install the replacement in the same position.
4. Reconnect every cable, close the case, plug in the AC cord and power on to confirm the system boots and the fan spins.