CORSAIR RM850e vs Fasgear PCI-e 5.0 12VHPWR
Updated August 2026 — The CORSAIR RM850e is a superior choice for those needing a reliable power supply, while the Fasgear PCI-e 5.0 12VHPWR serves as a budget-friendly extension solution.
The CORSAIR RM850e is a superior choice for those needing a reliable power supply, while the Fasgear PCI-e 5.0 12VHPWR serves as a budget-friendly extension solution.
Why CORSAIR RM850e is better
Power Supply
The RM850e is a fully modular PSU offering reliable power delivery.
Noise Levels
The RM850e operates quietly under load due to its efficient fan.
Build Quality
The RM850e has a higher build quality compared to an extension cable.
Why Fasgear PCI-e 5.0 12VHPWR is better
Price
The Fasgear is significantly cheaper at £18.00.
Cable Length
The Fasgear offers a 30cm extension for better cable management.
Targeted Use
The Fasgear is specifically designed for modern GPUs.
Overall score
Specifications
| Spec | CORSAIR RM850e | Fasgear PCI-e 5.0 12VHPWR |
|---|---|---|
| Brand | Corsair | Fasgear |
| Type | Power Supply | Extension Cable |
| Certification | ATX 3.1 | N/A |
| Fan Size | 120mm | N/A |
| Cable Type | Modular | Sleeved |
Dimension comparison
Overview of the Products
When it comes to power solutions for your PC, the CORSAIR RM850e and the Fasgear PCI-e 5.0 12VHPWR serve different purposes and target audiences. The CORSAIR RM850e is a fully modular power supply unit (PSU) priced at £85.99, while the Fasgear is a more budget-friendly extension cable available for £18.00. Understanding their distinct functionalities and features is crucial for making an informed choice.
Design and Build Quality
The CORSAIR RM850e boasts a fully modular design, allowing users to connect only the cables necessary for their system. This feature not only enhances the aesthetics of your build but also improves airflow by reducing cable clutter. In contrast, the Fasgear PCI-e 5.0 12VHPWR is an extension cable designed to accommodate high-performance GPUs like the RTX 3090ti and 4000 Series. While the Fasgear cable offers a neat and tidy solution with its sleeved design and included acrylic clips, it does not provide the same level of build quality as a dedicated PSU like the CORSAIR.
Performance and Efficiency
The CORSAIR RM850e is Intel ATX 3.1 certified, ensuring compatibility with modern hardware and the ability to withstand transient power excursions from GPUs. It is rated to deliver a steady output, supported by 105°C-rated capacitors for reliable performance. On the other hand, the Fasgear extension cable supports up to 600W output and is designed for optimum performance with specific GPUs. However, it requires a compatible PSU with unoccupied 8-pin PCI-e ports to function properly, limiting its usability with non-compliant power supplies.
Noise Levels
One of the standout features of the CORSAIR RM850e is its low-noise operation, attributed to a 120mm rifle bearing fan that maintains minimal noise levels even under full load. This is particularly beneficial for users who prioritise a quiet computing environment. In contrast, the Fasgear extension cable does not have any active cooling components, meaning its noise performance is not applicable. Users utilising it with their PSUs must consider the noise levels of their existing power supply unit.
Compatibility
The CORSAIR RM850e is compatible with a wide range of systems due to its modularity and adherence to contemporary power standards. It is particularly well-suited for high-performance gaming rigs needing reliable power delivery. On the other hand, the Fasgear PCI-e 5.0 12VHPWR is specifically designed for modern GPUs like the RTX 4070 and 4090 series. Users must ensure that their power supply meets the recommended wattage (500W-700W) for optimal performance, which may limit its audience to those with higher-end systems.
Price Comparison
The pricing of these two products reflects their different roles in a PC build. The CORSAIR RM850e is priced at £85.99, a significant investment for a quality power supply that offers modularity, reliability, and performance. Conversely, the Fasgear PCI-e 5.0 12VHPWR is priced at just £18.00, catering to those looking for a cost-effective solution to extend their GPU power connection. While the lower price of the Fasgear may appeal to budget-conscious consumers, it does not offer the comprehensive features of a full PSU.
User Experience and Installation
Installation of the CORSAIR RM850e is straightforward, thanks to its fully modular design, which allows users to connect only the necessary cables. This can significantly simplify building or upgrading a system. The low-noise fan contributes to a pleasant user experience during operation. Meanwhile, the Fasgear extension cable also aims for ease of use, with its 30cm length providing flexibility in cable management. However, users must be cautious about compatibility with their PSU and GPU requirements, which could complicate installation for those unfamiliar with power connections.
Which should you buy?
Choosing between the CORSAIR RM850e and the Fasgear PCI-e 5.0 12VHPWR ultimately depends on your specific needs. If you are constructing a high-performance system or upgrading an existing one, the CORSAIR RM850e is a robust choice with its reliable power delivery and efficient operation for £85.99. However, if you are simply looking for a budget-friendly extension solution for a compatible GPU, the Fasgear for £18.00 could be the right fit. Assess your requirements carefully to make the best decision for your setup.
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