Building a Small Form Factor (SFF) PC is an exciting challenge for gamers, creators, and enthusiasts who want the best of both worlds: high performance in a sleek, space-saving design. These compact builds are perfect for anyone looking to save space without giving up the power needed for gaming, content creation, or multitasking. They’re also a great option if you want something portable and stylish.
That said, building an SFF PC comes with its own set of challenges especially when it comes to picking the right components. Every choice matters in a small build, and one of the most important decisions is your power supply unit (PSU).
That’s where SFX and SFX-L power supplies come in: these compact PSUs are designed specifically for small cases, delivering reliable power while taking up minimal space. They let you maximize your build’s performance without cramming in oversized components. With so many options out there, it’s important to know what you need things like power output, efficiency, and noise levels to find the PSU that fits your build perfectly.
In this guide, we’ll break down everything you need to know about SFX and SFX-L power supplies. We’ll share insights on the best brands and models we carry at Computer Lounge, highlighting what makes them stand out so you can make an informed choice for your system.
And that’s not all. At the end, we’ll introduce you to a lineup of SFF cases that pair beautifully with these power supplies. Whether you’re planning a portable gaming rig or a compact workstation, these cases will help you create a setup that’s powerful, efficient, and looks amazing.
What to Consider When Buying an SFX Power Supply
1. Form Factor: SFX vs. SFX-L
The first step is determining the form factor that fits your case:
- SFX: The industry standard for compact cases. Smaller in size and perfect for mini-ITX builds.
- SFX-L: Slightly longer than SFX, generally offering higher wattage capacities or larger cooling fans. SFX-L units require a bit more space, so ensure your case supports it before buying.
2. Wattage: Matching Your Hardware’s Needs
Your power supply’s wattage must meet the demands of your CPU, GPU, and other components.
- Entry-level builds: 500W is sufficient for most setups without high-end GPUs.
- Mid-tier builds: 650–750W is ideal for systems with moderate to high-performance GPUs.
- High-end builds: 850W or 1000W SFX power supplies are necessary for enthusiasts with top-tier GPUs or overclocking setups.
3. Cable Management: Modular vs. Non-Modular
Modular PSUs let you connect only the cables you need, significantly improving cable management and airflow, especially in tight cases. While non-modular PSUs are more affordable, they add unnecessary clutter, which can affect cooling performance in an SFF build. A fully modular SFX power supply is the gold standard for SFF enthusiasts.
4. Efficiency Ratings
A PSU’s efficiency measures how effectively it converts AC power to DC power, with less energy lost as heat. Ratings are based on efficiency at 20%, 50%, and 100% load levels.
- 80 Plus Bronze: 82% efficiency at 20% load, 85% at 50%, and 82% at 100%. Ideal for most budget-conscious builds.
- 80 Plus Gold: 87% efficiency at 20% load, 90% at 50%, and 87% at 100%. A balanced choice for performance and value.
- 80 Plus Platinum: 90% efficiency at 20% load, 92% at 50%, and 89% at 100%. Best for enthusiasts prioritizing energy savings and cooler operation.
- Higher efficiency: Saves on electricity costs, especially where power is expensive.
- Generates less heat, reducing the strain on your PC’s cooling system.
- Offers quieter operation due to lower fan speeds.
What to Choose?
- Bronze: Suitable for average builds and most users.
- Gold: Great for performance-focused setups and long-term value.
- Platinum: Ideal for those seeking premium efficiency and reduced heat output.
SFX Power Supply Brands at Computer Lounge
At Computer Lounge, we stock top SFX PSU brands, including Silverstone, Fractal Design, Thermalright, and Thermaltake. Each brand offers unique features, making it easy to find a PSU tailored to your build. Here's a closer look.
Silverstone
About Silverstone: Renowned for its innovative and high-performance power supplies, particularly for small form factor PCs. Their SFX and SFX-L units are trusted by PC enthusiasts for their reliability, efficiency, and cutting-edge technology.
Name Price Wattage Efficiency Level Form Factor| Product | Name | Price | Wattage | Efficiency Level | Form Factor |
|---|---|---|---|---|---|
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Silverstone SX1000R | $429 | 1000W | Platinum | SFX-L |
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Silverstone EX850R | $329 | 850W | Platinum | SFX |
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Silverstone SX750-PT | $269 | 750W | Platinum | SFX |
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Silverstone SX500-G | $159 | 500W | Gold | SFX |
Fractal Design
About Fractal Design: Known for elegant Scandinavian design and performance, Fractal Design excels in creating components tailored for both function and style. Their Ion SFX series blends efficiency and quiet operation with sleek aesthetics, perfect for SFF builders who value silence and efficiency.
| Product | Name | Price | Wattage | Efficiency Level | Form Factor |
|---|---|---|---|---|---|
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Fractal Design Ion SFX 650W | $189 | 650W | Gold | SFX-L |
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Fractal Design Ion SFX 500W | $159 | 500W | Gold | SFX-L |
Thermalright
About Thermalright: Thermalright combines high-quality components and advanced technology to produce power supplies that are efficient and powerful. Their PSUs are especially popular for their sleek white designs and reliable performance.
| Product | Name | Price | Wattage | Efficiency Level | Form Factor |
|---|---|---|---|---|---|
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Thermalright TR-TPFX 850 | $299 | 850W | Platinum | SFX |
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Thermalright TR-TPFX 750 | $249 | 750W | Platinum | SFX |
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Thermalright TR-TGFX 850 | $259 | 850W | Gold | SFX |
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Thermalright TR-TGFX 550 | $169 | 550W | Gold | SFX |
Thermaltake
About Thermaltake: A household name in PC hardware, Thermaltake is known for delivering power supplies for all types of builds. Their Toughpower SFX series is popular among gamers and professionals who demand performance and reliability.
| Product | Name | Price | Wattage | Efficiency Level | Form Factor |
|---|---|---|---|---|---|
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Thermaltake Toughpower SFX 1000 | $359 | 1000W | Platinum | SFX-L |
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Thermaltake Toughpower SFX 850 | $329 | 850W | Gold | SFX |
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Thermaltake Toughpower SFX 750 | $279 | 750W | Gold | SFX |
5. Small Form Factor Builds: Why They're Popular
Style Meets Functionality
SFF cases are often crafted with aesthetics in mind, offering sleek, minimalist designs that complement modern workspaces. Whether placed on a desk or integrated into a home entertainment system, these builds look as good as they perform.
Optimized Cooling and Efficiency
While compact, SFF builds often feature innovative cooling solutions, such as custom airflow paths, liquid cooling options, and efficient thermal management. Pairing the build with a high-quality mini-ITX power supply ensures reliable and efficient power delivery without generating excessive heat.
Who Benefits Most from SFF PCs?
- Gamers: High-performance GPUs and CPUs fit seamlessly into these small cases, providing smooth gaming experiences even at 1440p or 4K resolutions.
- Streamers and Creators: Portability and power make SFF PCs ideal for creating and streaming content, especially in limited spaces.
- Professionals: Compact builds fit well in office environments where desk space is at a premium.
Popular Small Form Factor Cases
| Name | Price | Dimensions (L x W x H) | Key Features | |
|---|---|---|---|---|
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SSUPD Meshlicious Mini ITX Case | $199 | 245 x 166 x 360 mm | Full mesh design for excellent airflow, supports GPUs up to 332mm. |
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SSUPD Meshroom D Mini ITX Case | $199 | 247 x 167 x 363 mm | Compact size with mesh panels, versatile layout for various hardware. |
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Corsair iCUE 2000D RGB AirFlow ITX Tower Case | $269.95 | 271 x 200 x 458 mm | RGB-enabled airflow case with support for 360mm radiators. |
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Fractal Design Terra Mini ITX Case | $399 | 343 x 153 x 218 mm | Premium aluminum build, space-saving design, supports SFX PSUs. |
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Fractal Design Ridge Mini ITX Case | $299 | 355 x 95 x 375 mm | Slim profile, PCIe 4.0 riser card included, vertical or horizontal orientation. |
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Fractal Design Mood Mini ITX Tower Case | $299 | 212 x 212 x 453 mm | Elegant design, ample room for cooling, compact yet versatile. |
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Silverstone SUGO SG15 Mini ITX Case | $139 | 366 x 247 x 211 mm | Compact cube design, excellent hardware compatibility, integrated handle. |
At Computer Lounge, we’re dedicated to helping you create the perfect PC build, whether it’s a powerful small form factor setup or a full-sized rig. Our range of SFX and SFX-L power supplies, combined with expert advice, ensures you’ll find the right components to match your needs and budget.
If you need any assistance or have questions, feel free to contact us here or visit us in-store. We’re here to help you bring your dream PC to life!
