Dell Optiplex 760 Desktop 255W Power Supply N249M - OEM Replacement

In this review the Dell Genuine OEM Optiplex 760 Desktop 255W Power Supply N249M is assessed as a straightforward replacement option for older Optiplex 760 machines. The bottom line is that this unit is aimed at technicians and owners who need a compatible, factory-original spare to restore system stability; our review finds it delivers the exact fit and nominal power expected from a Dell OEM part, making it the simplest way to get a decommissioned or repaired Optiplex 760 back into service without modifying connectors or case fittings.

Key Features

• OEM compatibility: Designed specifically for the Optiplex 760, it reproduces the original fit and connector layout so installation is typically plug-and-play for that model.
• 255W rated output: The rated 255W capacity provides the same power envelope as the factory unit, helping to maintain stable operation under typical office workloads.
• Factory part number: Marked as L255P-01, which helps confirm it is a genuine Dell replacement rather than a generic third-party supply.
• Built for internal mounting: The supply is sized and configured for internal installation in the Optiplex 760 chassis, avoiding the need for adapters or custom brackets.
• Direct swap convenience: Because it matches the original spec and connectors, downtime and troubleshooting are minimized during repairs.

Who It's For

This power supply is best for IT technicians, refurbishers, and owners of Dell Optiplex 760 desktop systems who need a like-for-like replacement that maintains factory compatibility. If the system shows power instability, fails to boot, or the original supply has failed, this OEM unit is the logical choice to restore the machine without changing power distribution or case layout.

Those with newer Dell systems, non-Optiplex 760 desktops, or users looking for higher wattage for upgrades should look elsewhere. It is not intended as a universal or high-performance upgrade for modern GPUs or power-hungry add-ins, but rather as an authentic replacement for the original Optiplex 760 configuration.

Pros & Cons

Pros

• Exact OEM fit for the Optiplex 760, which simplifies installation and reduces compatibility risks.
• Matches the original 255W rating, maintaining the system's intended power margin for office tasks.
• Identified as model L255P-01, providing confidence it is a Dell genuine replacement component.

Cons

• Limited to 255W, so it is not suitable for systems that require higher capacity for upgrades.

Specifications

Brand	Dell
Model / Part	L255P-01 (N249M)
Output Power	255W
Intended For	Optiplex 760 desktop
Type	Internal power supply

Our Verdict

For anyone repairing or refurbishing a Dell Optiplex 760, this genuine OEM 255W power supply is a practical, economical choice that preserves original compatibility and reduces troubleshooting. It is good value for restoring stock systems, though users planning performance upgrades should select a higher-capacity solution.

Frequently Asked Questions

Is this power supply a genuine Dell part?
Yes, it is listed as the Dell factory replacement marked L255P-01 for the Optiplex 760.

Will it fit other Dell models?
It is designed specifically for internal mounting in the Optiplex 760 and may not fit or match connectors on other models.

Is 255W enough for upgrades?
255W is suitable for stock office configurations but may be insufficient for significant GPU or high-power CPU upgrades.