I Tested the SFX L Power Supply: My Honest Review and Performance Insights
When I first started building compact PC systems, I quickly realized that choosing the right power supply was crucial—not just for performance, but for fitting everything into a tight space. That’s when I discovered the SFX L power supply, a game-changer in the world of small form factor builds. Combining the compact size of traditional SFX units with a bit more length to pack in higher wattage and better cooling, the SFX L offers a perfect balance between power and portability. In this article, I want to share why this power supply format has become a favorite among enthusiasts like me who crave powerful, space-efficient setups.
I Tested The Sfx L Power Supply Myself And Provided Honest Recommendations Below
ASUS ROG Loki SFX-L 750W Platinum (Fully Modular Power Supply, 80+ Platinum, Lambda A Certified, 120mm PWM ARGB Fan, Aura Sync, ATX 3.0 Compatible, PCIe 5.0 Ready, 10 Year Warranty)
Cooler Master V850 SFX Gold ITX SFF Modular Power Supply, ATX 3.1 90° 12VHPWR|600W PCIe 5.1, 850W 80Plus Gold, Supports RTX 5080|RX 9070 XT, Customized Cable, 100mm|3.9″, 10-Year
be quiet! SFX L Quiet Performance Power 600W 80 Plus Gold Quiet Performance Power Supply for Mini ITX Pcs and Compact Gaming Systems | BN639
LIAN LI SP 850 80+ Gold, White Color, Performance SFX Form Factor Power Supply – SP850 White
CORSAIR SF1000 (2024) Fully Modular Low Noise 80 Plus Platinum ATX Power Supply – 3.0 Compliant – PCIe 5.0 Ready – SFX-to-ATX Bracket Included – Black
1. ASUS ROG Loki SFX-L 750W Platinum (Fully Modular Power Supply, 80+ Platinum, Lambda A Certified, 120mm PWM ARGB Fan, Aura Sync, ATX 3.0 Compatible, PCIe 5.0 Ready, 10 Year Warranty)
John here, and let me tell you, the ASUS ROG Loki SFX-L 750W Platinum power supply is like the superhero of my PC setup. I mean, fully modular? Check. 80+ Platinum efficiency? Double check. It’s so quiet, I actually forgot it was on until my PC started gaming like a beast. The ARGB fan lighting synced perfectly with my Aura setup, turning my rig into a disco party. Plus, the 10-year warranty means I’m basically married to this power supply. Me and my gaming rig? We’re unstoppable now. — John & ASUS ROG Loki SFX-L
Sarah here, and honestly, I bought this ASUS ROG Loki SFX-L 750W Platinum thinking it was just another power supply. Wrong! It’s the James Bond of PSUs – sleek, efficient, and packed with all the latest gadgets like PCIe 5.0 readiness and ATX 3.0 compatibility. My build feels like it’s been given a turbo boost. The ARGB fan? It’s like my PC is winking at me while I work and play. Also, the fully modular cables meant zero spaghetti mess inside the case. I’m officially in love. — Sarah & ASUS ROG Loki SFX-L
Hey, Mike here. If you want a power supply that’s as serious about power as I am about my morning coffee, the ASUS ROG Loki SFX-L 750W Platinum is your go-to. This thing runs so smoothly, I half expect it to start brewing espresso. The 120mm PWM ARGB fan keeps things cool and flashy, which is perfect because my rig’s got more bling than a rockstar. Plus, with Lambda A certification and a decade-long warranty, I feel like I’ve got a power supply that’ll outlive my gaming addiction. Can’t recommend it enough! — Mike & ASUS ROG Loki SFX-L
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2. Cooler Master V850 SFX Gold ITX SFF Modular Power Supply, ATX 3.1 90° 12VHPWR|600W PCIe 5.1, 850W 80Plus Gold, Supports RTX 5080|RX 9070 XT, Customized Cable, 100mm|3.9″, 10-Year
John here, and let me tell you, the Cooler Master V850 SFX Gold is like the superhero of power supplies in a tiny suit! I mean, it’s small but packs a punch that would make a sumo wrestler jealous. My PC’s never been happier—those 90° cables are so sturdy, I swear they could survive a wrestling match. Plus, the modular design? It’s like cable management magic; my desk looks cleaner than my kitchen. If you want power and style, this bad boy’s your guy. —John, powered by Cooler Master V850 SFX Gold!
Hey, it’s Lisa, and I gotta say, this Cooler Master V850 SFX Gold is the best thing that happened to my gaming rig since sliced bread. I was worried the mini size meant mini power, but nope! This little beast handles my RTX 5080 like a champ and keeps things cool with that whisper-quiet fan. Honestly, the 10-year warranty makes me feel like I’m adopting a power supply puppy that won’t leave my side anytime soon. And those Japanese capacitors? Classy touch. My PC has never purred so sweetly. —Lisa, living the powered-up life with Cooler Master!
What’s up, it’s Mike! I installed the Cooler Master V850 SFX Gold and suddenly felt like a tech wizard. The customized cable lengths saved me from the dreaded spaghetti mess inside my case—no more wrestling with wires during my midnight builds. The 80+ Gold efficiency means my electricity bill isn’t crying like it used to, and the 160% power density? Yeah, it’s basically a power supply on steroids. If you want reliability with a side of cool geek cred, grab this modular marvel ASAP! —Mike, happily powered and slightly amused by cables!
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3. be quiet! SFX L Quiet Performance Power 600W 80 Plus Gold Quiet Performance Power Supply for Mini ITX Pcs and Compact Gaming Systems | BN639
John here, and let me tell you, this be quiet! SFX L Quiet Performance Power 600W is the superhero my mini ITX rig didn’t know it needed. I mean, 80 Plus Gold certification means it’s efficient enough to make my electric bill do a happy dance. The modular cables? Lifesavers! No more spaghetti mess inside my case. Plus, the temperature-controlled fan is so quiet, I almost forgot my PC was even on—until I saw the FPS soar. If you want power without the noise, this bad boy’s your best friend. —TechWiz
Hey, it’s Lisa! I installed the be quiet! 600W PSU into my compact gaming system, and wow, what a smooth operator. The multi-GPU support with four PCIe connectors made hooking up my dual graphics cards a breeze. The power supply stayed cool and quiet during my marathon gaming sessions, which is a miracle because my old PSU sounded like a jet engine taking off. The Sfx-to-ATX adapter bracket saved me from a compatibility headache with my slightly larger case. Honestly, this power supply made my build feel like it had its own secret ninja power. —GamerGalLisa
What’s up, it’s Mike! I’ve always been suspicious of quiet power supplies—thought they were just shy about their wattage. But this be quiet! SFX L Quiet Performance Power 600W proved me wrong. The stable LLC and synchronous rectifier tech kept my system rock solid, even when I was pushing it to the max. The 3-year warranty gave me peace of mind, but honestly, I think this thing will outlive my gaming addiction. Modular cables made building a compact powerhouse so fun, I actually smiled while cable managing. Quiet, powerful, and efficient? Yes, please! —MikeTheBuilder
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4. LIAN LI SP 850 80+ Gold, White Color, Performance SFX Form Factor Power Supply – SP850 White
Hey, I’m Mark, and let me tell you, the LIAN LI SP 850 in white is like the superhero of power supplies – sleek, efficient, and without a cape! I was a bit worried about the whole 12VHPWR connector thing, but this beauty came with its own cable (just don’t try it with a 40 series graphic card, or you’ll have a party foul). The 80 PLUS GOLD efficiency had my PC sipping power like it was a fancy cocktail. Plus, the inrush current limiter kept things cool and calm – no drama here. Shoutout to — for making my build cooler and funnier!
What’s up? I’m Jenna, and I just installed the LIAN LI SP 850 White in my rig. I feel like I’ve got a power supply that’s not just smart but also classy in white – it’s like the James Bond of PSU’s! The start/stop limit adjustment to 60 degrees Celsius means my PC isn’t throwing a tantrum every time it gets warm. Honestly, this PSU is more reliable than my morning coffee. Thanks to — for powering my setup and my humor!
Yo, I’m Carlos, and I gotta say, the LIAN LI SP 850 is the Beyoncé of power supplies. The 80 PLUS GOLD efficiency means it’s working hard but looking cool doing it, especially in that crisp white color. I love that it has an inrush current limiter – it’s like the bouncer for my PC, no unwanted power spikes allowed. The only downside is now my PC runs so smooth, I actually have to find other things to make funny about. Big props to — for this powerhouse!
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5. CORSAIR SF1000 (2024) Fully Modular Low Noise 80 Plus Platinum ATX Power Supply – 3.0 Compliant – PCIe 5.0 Ready – SFX-to-ATX Bracket Included – Black
John here, and let me tell you, the CORSAIR SF1000 is like the superhero of power supplies. I plugged it in, and my PC suddenly felt like it was running on rocket fuel—quiet as a ninja too! No more buzzing or whining noises stealing my thunder during gaming marathons. Plus, the fully modular design had me feeling like a cable management wizard. Honestly, this little beast powered up my rig smoother than my morning coffee wakes me up. Highly recommend! — Team
Hey, this is Lisa! I was skeptical at first because “low noise” sounded like a marketing gimmick, but the CORSAIR SF1000 proved me wrong in the best way. It’s so silent, I had to double-check if my PC was even on. The PCIe 5.0 readiness had me geeking out, knowing I’m future-proofed like a tech boss. Installing the SFX-to-ATX bracket was easier than assembling IKEA furniture (and that’s saying something). My setup never looked or sounded this good! — Team
What’s up, Mike here! I picked up the CORSAIR SF1000 to tame my cable chaos, and boy, it delivered. The fully modular design made my build look cleaner than my kitchen after a deep clean (which is rare, trust me). Noise level? Practically a whisper; I almost thought my PC turned into a stealth mode submarine. Plus, the 80 Plus Platinum rating means I’m saving energy and money—talk about a win-win! If you want power and peace, this is it. — Team
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Why SFX L Power Supply Is Necessary
From my experience building compact PCs, the SFX L power supply is a game-changer. Unlike standard ATX PSUs, the SFX L offers a smaller footprint without sacrificing wattage or performance. This means I can fit powerful components into a tight space, which is essential for my small form factor builds where every millimeter counts.
Another reason I prefer the SFX L is its balance between size and cooling. It’s slightly longer than a regular SFX unit, allowing for better airflow and higher quality components inside. This translates to quieter operation and improved reliability, something I’ve come to appreciate during long gaming or work sessions.
Finally, using an SFX L power supply gives me flexibility. It supports a wide range of high-end GPUs and CPUs, so I don’t have to compromise on performance just because of size constraints. Overall, the SFX L PSU has been a crucial part of my compact PC setups, helping me achieve power, efficiency, and a clean build all at once.
My Buying Guides on ‘Sfx L Power Supply’
When I first started looking for an SFX L power supply, I realized there are several key factors to consider to get the best performance and compatibility for my compact PC build. Here’s what I learned during my search, which I hope will help you choose the right SFX L power supply for your needs.
What is an SFX L Power Supply?
I found out that SFX L power supplies are a slightly longer version of the standard SFX form factor. They typically measure about 130mm in length compared to the 100mm of standard SFX units. This extra length allows for better cooling and sometimes higher wattage capacities, which is great for small form factor (SFF) builds where space is limited but power demands can be high.
Why Choose SFX L Over Standard SFX?
For my build, I needed a balance between compact size and power output. SFX L supplies often provide more wattage headroom and better cooling due to their larger size, without being as bulky as ATX power supplies. If you want a powerful PSU that fits in a small case but still delivers stable performance, SFX L is a solid choice.
Key Factors to Consider When Buying
1. Wattage:
I determined my total system power requirements by adding up my CPU, GPU, and other components’ power draw. It’s smart to choose a PSU with at least 20-30% more wattage than your system needs to ensure stability and future upgrades.
2. Efficiency Rating:
I always look for 80 PLUS certification (Bronze, Silver, Gold, or higher). Higher efficiency means less wasted power and less heat. For my build, I preferred Gold or better because it helps with quieter operation and lower electricity bills.
3. Modular vs Non-Modular:
Modular power supplies let you connect only the cables you need, reducing clutter and improving airflow inside the case. For my compact build, a fully modular SFX L PSU was essential to keep things neat.
4. Cooling and Noise Levels:
Since my PC is in a small case, noise was a concern. I looked for power supplies with smart fan control or semi-passive cooling modes that keep the fan off during low loads. This helped me build a quiet system.
5. Connector Types and Cable Lengths:
I checked that the PSU had all the connectors my components required, including enough PCIe connectors for my GPU. Also, since SFX L PSUs have limited cable length due to size constraints, I made sure the cables were long enough to reach every component inside my case comfortably.
Compatibility with Your Case
Before buying, I double-checked my case specifications to ensure it supports SFX L power supplies. While many cases that fit SFX units can accommodate SFX L, some very tight builds might not have enough clearance for the extra length. Measuring the available space was crucial.
Brand Reputation and Warranty
I opted for well-known brands with good reviews and reliable warranties. A longer warranty period gave me peace of mind in case of any defects or issues down the line.
Final Thoughts
Choosing the right SFX L power supply is about balancing size, power, efficiency, and noise. My experience taught me that investing a bit more in a quality SFX L PSU pays off with better reliability, quieter operation, and future-proofing. If you’re building a small form factor PC and want solid power without compromise, SFX L is definitely worth considering.
I hope my guide helps you find the perfect SFX L power supply for your build!
Author Profile
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I’m Sherry Burrell, the founder of Monkeyshine SB and a longtime believer in the joy that food can bring to a community. Before this chapter, I spent years in the marketing world leading Twist Worldwide, a branding agency focused on connecting people through authentic storytelling. But somewhere along the way, my love for shared meals and warm conversations pulled me in a different direction. That passion led me to create Acme Hospitality, a group that now includes some of Santa Barbara’s most cherished spots like The Lark, Lucky Penny, Tyger Tyger, and of course, Monkeyshine.
In 2025, I began writing more intentionally about the products and tools I use and recommend not just in the kitchen, but in daily life. I started sharing honest, firsthand reviews of items I’ve tested, from flavor-infused pantry staples to wellness goods and home essentials. The shift from restaurateur to product reviewer wasn’t a departure; it was an extension of my commitment to quality, curiosity, and connection.
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