When building a Small Form Factor (SFF) PC, every component matters, but the power supply (PSU) often gets overlooked. However, a reliable, efficient, and compact PSU is the backbone of any SFF build. These power supplies aren’t just about delivering power—they must fit snugly into tiny cases while supporting high-performance hardware.
This year’s top SFF PSUs combine cutting-edge efficiency, innovative designs, and powerful wattage ratings. Here’s our roundup of the best SFF PSUs of 2025 to power your compact dream machine.
Best SFF PSUs: Quick Comparision
| PSU | Form Factor | Wattage | Efficiency Rating | Modularity | Price (Amazon) |
| ASUS ROG Loki SFX-L 1000W Platinum | SFX-L | 1000W | 80+ Platinum | Full Modular | $249 – Buy Now |
| Thermaltake Toughpower SFX (ATX 3.0) 850W | SFX | 850W | 80+ Gold | Full Modular | $120 – Buy Now |
| CORSAIR SF850 | SFX | 850W | 80+ Platinum | Full Modular | $200 – Buy Now |
| Cooler Master V850 SFX | SFX | 850W | 80+ Gold | Full Modular | $143 – Buy Now |
| LIAN LI SP 750W 80+ Gold | SFX | 750W | 80+ Gold | Full Modular | $140 – Buy Now |
| Redragon PSU015 80+ Platinum 750W | SFX | 750W | 80+ Platinum | Full Modular | $140 – Buy Now |
| be quiet! SFX L Quiet Performance Power 600W | SFX-L | 600W | 80+ Gold | Full Modular | $189 – Buy Now |
Best SFF PSUs: Top Picks
ASUS ROG Loki SFX-L 1000W Platinum
Quick Highlights
- Wattage: 1000W
- Efficiency: 80+ Platinum
- Form Factor: SFX-L
- Special Features: ARGB lighting, ASUS Aura Sync compatibility, ultra-quiet axial-tech fan
The ASUS ROG Loki SFX-L 1000W Platinum is an engineering marvel, delivering an astonishing 1000 watts of power in an SFX-L form factor. This PSU is built for extreme builds that demand the highest performance, capable of powering high-wattage GPUs like the RTX 4090 alongside top-tier CPUs. With its 80+ Platinum certification, the Loki ensures minimal energy loss and reduced heat generation, making it both efficient and eco-friendly.
What sets the Loki apart is its unique blend of functionality and aesthetics. The ARGB lighting integrated into the PSU is compatible with ASUS Aura Sync, allowing seamless customization to match your PC’s theme. The 120mm axial-tech fan keeps temperatures in check, operating quietly even under heavy loads, ensuring your system stays cool without becoming a noise machine.
Pros
- Industry-leading wattage for SFF builds
- Stunning ARGB lighting with ASUS Aura Sync
- Exceptional efficiency and quiet operation
Cons
- Larger SFX-L size may not fit all cases
- Premium pricing
Thermaltake Toughpower SFX (ATX 3.0) 850W
Quick Highlights
- Wattage: 850W
- Efficiency: 80+ Gold
- Form Factor: SFX
- Special Features: ATX 3.0 and PCIe 5.0 ready, modular design
The Thermaltake Toughpower SFX 850W is a forward-thinking PSU designed to handle the next generation of hardware. With full ATX 3.0 and PCIe 5.0 compatibility, it’s ready for GPUs that demand the new 12VHPWR connector, ensuring future-proofing for years to come. The 80+ Gold efficiency rating provides reliable power delivery, keeping energy waste to a minimum while offering excellent thermal performance.
Thermaltake didn’t stop at functionality; the design is compact yet robust, making it ideal for high-performance SFF builds. Fully modular cables make cable management a breeze, especially in tight spaces. Additionally, the cooling system features a smart fan that adapts to load requirements, offering quiet operation during low and medium workloads while keeping components safe during intensive use.
Pros
- Future-proof design with ATX 3.0 and PCIe 5.0 support
- Gold efficiency for reliable performance
- Compact size and modular cables
Cons
- Gold certification may not match Platinum competitors in efficiency
- Slightly higher thermal output under full load
CORSAIR SF850
Quick Highlights
- Wattage: 850W
- Efficiency: 80+ Platinum
- Form Factor: SFX
- Special Features: Quiet fan with zero-RPM mode, modular cables
The CORSAIR SF850 is a gold standard in SFX PSUs, offering 850W of stable power with an 80+ Platinum certification. This PSU is perfect for demanding SFF builds, providing ample power for high-performance GPUs and CPUs while ensuring optimal efficiency. Its quiet 92mm fan features a zero-RPM mode, remaining silent during low-load operations, making it ideal for quiet workspaces or entertainment setups.
The SF850 is designed with builders in mind. Its fully modular design ensures clean cable management, a must in compact cases where space is at a premium. The high-quality components used in its construction promise long-term reliability, making it a trusted choice for enthusiasts. Whether you’re gaming, rendering, or multitasking, the SF850 delivers consistent performance with minimal noise.
Pros
- High efficiency with Platinum certification
- Quiet and reliable operation with fan-off mode
- Compact design suitable for most SFF cases
Cons
- Slightly higher price compared to Gold-certified alternatives
Cooler Master V850 SFX
Quick Highlights
- Wattage: 850W
- Efficiency: 80+ Gold
- Form Factor: SFX
- Special Features: Compact design, modular cables, high efficiency
The Cooler Master V850 SFX is a solid performer designed for high-end SFF builds. With its 850W capacity, this PSU can handle modern GPUs and CPUs with ease, making it ideal for gaming or workstation setups. Its 80+ Gold certification ensures efficient power delivery, reducing waste heat and improving overall system reliability.
One of the V850 SFX’s standout features is its compact form factor, which allows it to fit seamlessly into even the smallest of cases. The fully modular cable system ensures neat and tidy cable management, critical for airflow in tight builds. Despite its small size, the V850 SFX delivers consistent power output, and its smart fan design ensures quiet operation under both light and heavy workloads.
Pros
- Reliable power delivery for high-performance systems
- Compact size ideal for small cases
- Fully modular for clean and efficient builds
Cons
- Gold certification, while efficient, isn’t as high-performing as Platinum
- Can run warm under extended full-load conditions
LIAN LI SP 750W 80+ Gold
Quick Highlights
- Wattage: 750W
- Efficiency: 80+ Gold
- Form Factor: SFX
- Special Features: PCIe 5.0 ready, modular design, compact build
The LIAN LI SP 750W is a balanced and efficient PSU perfect for mid-to-high-end SFF builds. With its 750W output, it supports most modern components, including GPUs requiring PCIe 5.0 compatibility. Its 80+ Gold certification ensures reliable performance with reduced energy consumption, keeping heat and noise levels in check.
What sets the SP 750W apart is its thoughtful design. The PSU is extremely compact, fitting snugly into most SFF cases without sacrificing performance. Fully modular cables allow for flexible cable routing, ensuring a neat and organized build. LIAN LI’s focus on quality ensures this PSU can power gaming rigs and productivity machines alike, delivering consistent results every time.
Pros
- PCIe 5.0 readiness ensures future compatibility
- Compact design and modular cables are ideal for SFF setups
- Reliable power delivery with solid thermal performance
Cons
- Lacks Platinum-level efficiency
- Slightly limited wattage for ultra-high-end builds
Redragon PSU015 80+ Platinum 750W
Quick Highlights
- Wattage: 750W
- Efficiency: 80+ Platinum
- Form Factor: SFX
- Special Features: Affordable Platinum efficiency, compact design
The Redragon PSU015 is a hidden gem for SFF builders on a budget. Despite its affordable price tag, this PSU offers 750W of power with an 80+ Platinum efficiency rating. This means less wasted energy, reduced heat, and long-term cost savings, making it a great option for users seeking efficiency without overspending.
The PSU015 is compact and modular, ensuring it fits snugly into SFF builds and allows for tidy cable management. Its performance is stable across a range of loads, making it suitable for mid-to-high-tier components. While it lacks some of the premium features found in higher-end PSUs, its price-to-performance ratio is hard to beat.
Pros
- Affordable Platinum efficiency for budget-conscious users
- Compact and modular design
- Reliable performance for mid-range and gaming builds
Cons
- Lacks premium features like ARGB or silent fans
- Not ideal for ultra-high-end setups
be quiet! SFX L Quiet Performance Power 600W
Quick Highlights
- Wattage: 600W
- Efficiency: 80+ Gold
- Form Factor: SFX-L
- Special Features: Whisper-quiet fan, focus on durability
The be quiet! SFX L Quiet Performance Power 600W is the perfect PSU for users who prioritize silence and reliability. With 600W of power, it’s ideal for compact builds that don’t require extreme wattage but still demand stable performance. Its 80+ Gold certification ensures efficient energy use, and the larger 120mm fan operates almost silently, even under load.
The SFX-L form factor makes this PSU slightly larger than standard SFX units, but the additional space allows for improved cooling and quieter operation. Its modular cables make building and cable management easy, and the overall build quality is top-notch, ensuring long-term reliability. This PSU is perfect for compact workstations or mid-range gaming PCs where quiet operation is a must.
Pros
- Incredibly quiet operation, even under load
- Durable and reliable design for long-term use
- Modular cables for cleaner builds
Cons
- Limited wattage for high-performance setups
- SFX-L form factor may not fit all cases
Conclusion
The right PSU ensures your SFF PC performs reliably, efficiently, and quietly. High-powered options like the ASUS ROG Loki SFX-L 1000W and Thermaltake Toughpower SFX 850W are perfect for demanding builds, while budget-friendly picks like the Redragon PSU015 offer great value with Platinum efficiency. For quieter setups, the be quiet! SFX L 600W excels in noise control.
No matter your priorities—power, efficiency, or affordability—this list has a top-tier PSU to match your compact build’s needs.
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