CORSAIR SF850 vs S-Union Upgraded New 240W L240ES-00 H240ES-02 Power Supply Compatible with Dell
Updated August 2026 — The CORSAIR SF850 is the superior choice for high-performance needs, while the S-Union power supply is a budget-friendly option for Dell systems.
The CORSAIR SF850 is the superior choice for high-performance needs, while the S-Union power supply is a budget-friendly option for Dell systems.
Why CORSAIR SF850 is better
Power Output
850 watts vs 240 watts
Efficiency
80 PLUS Platinum rating vs no rating
Build Quality
105°C rated capacitors vs unspecified quality
Why S-Union Upgraded New 240W L240ES-00 H240ES-02 Power Supply Compatible with Dell is better
Price
C$58.99 vs C$279.99
Compatibility
Designed for Dell systems vs general use
Warranty
18-month warranty vs unspecified
Overall score
Specifications
| Spec | CORSAIR SF850 | S-Union Upgraded New 240W L240ES-00 H240ES-02 Power Supply Compatible with Dell |
|---|---|---|
| Brand | Corsair | S-Union |
| Form Factor | SFX | ATX |
| Fan Size | 92mm | N/A |
| Connector Type | Fully Modular | Non-modular |
| Cooling Tech | PWM Fan | N/A |
Dimension comparison
Price Comparison
The CORSAIR SF850 is priced at C$279.99, while the S-Union Upgraded New 240W Power Supply is significantly cheaper at C$58.99. This stark difference of C$221.00 highlights the varying target markets for these power supplies. The CORSAIR SF850 is designed for high-performance, small form-factor PCs, justifying its price with premium features and higher wattage. In contrast, the S-Union power supply caters to budget-conscious consumers seeking a reliable option for compatible Dell systems. This price gap indicates that buyers should consider their specific needs and budget when choosing between these two products.
Power Output
The CORSAIR SF850 offers an impressive output of 850 watts, making it suitable for high-demand systems requiring substantial power. In contrast, the S-Union power supply provides 240 watts, which limits its application to lower-powered devices, primarily for Dell OptiPlex models. Users looking to build or upgrade a high-performance PC would benefit more from the higher wattage of the CORSAIR SF850. Conversely, those with less demanding setups will find the 240 watts of the S-Union adequate for their needs. This difference in power output directly affects performance and compatibility with various hardware.
Efficiency Ratings
The CORSAIR SF850 boasts an 80 PLUS Platinum rating, which ensures high energy efficiency, meaning less waste and lower electricity bills over time. The S-Union power supply does not specify an efficiency rating, which may raise concerns about its energy consumption and reliability. The high efficiency of the CORSAIR SF850 signifies that it is built to handle power spikes effectively, which is crucial for modern components. This efficiency is a vital aspect for users who prioritize both performance and sustainability, making the CORSAIR a more appealing choice for those focused on long-term costs.
Compatibility
The S-Union power supply is specifically compatible with several Dell OptiPlex models, including the 3667 and 5050, making it an ideal choice for users with those systems. It is crucial to check compatibility with the part numbers listed, such as H240ES-02 and L240ES-00, to ensure proper functionality. On the other hand, the CORSAIR SF850 is designed to be ATX 3.0 compliant and PCIe 5.0 ready, making it a versatile choice for a wide range of builds beyond just one brand. This broader compatibility can be beneficial for users looking to future-proof their systems or upgrade components over time.
Modular Design
The CORSAIR SF850 features a fully modular design with Type-5 Micro-Fit PSU connectors, allowing for tidy cable management and flexibility in small cases. This design enhances airflow within the case and simplifies the installation process, particularly in compact builds. In contrast, the S-Union power supply does not mention modularity, which may result in a more cluttered installation and potentially less efficient cooling. For users prioritizing aesthetics and ease of installation, the modular design of the CORSAIR SF850 presents a significant advantage.
Cooling System
The CORSAIR SF850 is equipped with a 92mm PWM cooling fan that delivers powerful cooling while maintaining low noise levels, thanks to its fluid dynamic bearing. This feature is particularly important for high-performance systems that generate substantial heat under load. The S-Union power supply does not specify any cooling technology, which raises concerns about its ability to manage heat effectively during operation. Users who demand quieter performance and efficient thermal management will find the cooling system of the CORSAIR SF850 to be a critical factor in their decision-making process.
Build Quality and Reliability
The CORSAIR SF850 is built with 105°C rated Japanese capacitors, ensuring unwavering power delivery and reliability in high-stress environments. This quality construction is essential for users who push their systems to the limit, as it minimizes the risk of failure. The S-Union power supply, while tested for various conditions, does not provide information on the component quality or temperature ratings, which may lead to uncertainty regarding its long-term reliability. For users who prioritize robust build quality, the CORSAIR SF850 stands out as the more trustworthy option.
Which should you buy?
Choosing between the CORSAIR SF850 and the S-Union Upgraded New 240W Power Supply ultimately depends on your specific needs and budget. If you are building a high-performance system that requires significant power and efficiency, the CORSAIR SF850 is the clear winner with its 850 watts, 80 PLUS Platinum rating, and superior build quality, priced at C$279.99. However, if you are looking for an affordable solution for a compatible Dell OptiPlex system, the S-Union power supply offers decent functionality at a much lower price of C$58.99. Assess your requirements carefully to select the power supply that best fits your situation.
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