Dell

Dell RT490 280W Power Supply for GX745/755

Name: Dell RT490 280W Power Supply for GX745/755
Brand: Dell
SKU: RT490

★★★★★4.0 (9 reviews)

280W

Reliable Power for Your Dell System The Dell RT490 is a 280W power supply unit designed to provide stable and efficient power to your Dell GX745/755 DT desktop. This unit ensures your system operates reliably, protecting your components from power fluctuations and ensuring consistent performance....

$35.84*

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*Price sourced from Amazon.com. Last updated:Jun 27, 2026.Price and availability are subject to change.

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Overview

Reliable Power for Your Dell System

The Dell RT490 is a 280W power supply unit designed to provide stable and efficient power to your Dell GX745/755 DT desktop. This unit ensures your system operates reliably, protecting your components from power fluctuations and ensuring consistent performance.

Specifications:

Brand: Dell
Model: RT490
Power Output: 280 Watts
Compatibility: Dell GX745/755 DT

Key Features

Genuine Dell Power Supply - 280w RT490

For Small Desktop Cases, not SFF or Tower

Optiplex 210L 330 740 745 760 GX520 GX620 and 755 Desktop Systems

for Dimension C521 and 3100c Systems

Specifications

Model

RT490

Power Output

280W

Type

Genuine Dell Power Supply

Case Compatibility

Small Desktop Cases (not SFF or Tower)

Optiplex Compatibility

210L, 330, 740, 745, 760, GX520, GX620, 755 Desktop Systems

Dimension Compatibility

C521, 3100c Systems

Pros & Cons

👍 Pros

Genuine Dell power supply, ensuring compatibility and reliability with specified Dell systems.
Offers a robust 280W power output, suitable for the specified desktop models.
Specifically designed for Small Desktop Cases, making it a tailored fit for compact Dell systems.
Compatible with a range of Dell Optiplex models including 210L, 330, 740, 745, 760, GX520, GX620, and 755 Desktop Systems.
Also compatible with Dell Dimension C521 and 3100c Systems, broadening its utility for specific older models.

👎 Cons

Explicitly stated as "not SFF or Tower," meaning it will not fit Small Form Factor or Tower cases.
Compatibility is limited to specific Dell desktop and Dimension systems, not a universal power supply.
280W might be insufficient for systems with higher power demands, such as those with dedicated graphics cards.
As a replacement part for older models, it might not offer the energy efficiency of newer power supply units.
No information provided on the number or type of connectors, which is crucial for internal component compatibility.

Frequently Asked Questions

What is the wattage of the Dell RT490 power supply?

The Dell RT490 power supply provides a power output of 280W, suitable for the compatible Dell desktop systems.

Which Dell systems are compatible with this RT490 power supply?

This genuine Dell power supply is compatible with Optiplex 210L, 330, 740, 745, 760, GX520, GX620, 755 Desktop Systems, and Dimension C521 and 3100c Systems.

Can this power supply be used in SFF (Small Form Factor) or Tower cases?

No, the Dell RT490 280W power supply is specifically designed for Small Desktop Cases and is explicitly stated as "not SFF or Tower."

Is this an original Dell part?

Yes, the description specifies that this is a Genuine Dell Power Supply, ensuring it meets Dell's manufacturing standards for the listed systems.

Are there any details about the power connectors included with this power supply?

The provided information details the wattage and system compatibility but does not include specifics regarding the types or number of power connectors.

Dell RT490 280W Power Supply for GX745/755

Overview