I Tested the Best ATX and Micro ATX Power Supplies: Here’s What You Need to Know!
When I first delved into the world of custom PC building, I quickly realized that the power supply is the unsung hero of any setup. It’s easy to get swept up in the excitement of choosing flashy components like graphics cards and motherboards, but the heart of a reliable system lies in its power source. This is where the ATX and Micro ATX power supplies come into play. These compact yet powerful units are designed to deliver stable energy to your components, ensuring that everything runs smoothly and efficiently. In this article, I’ll explore the intricacies of ATX and Micro ATX power supplies, shedding light on their importance, how they differ, and why choosing the right one can make all the difference in your build. Whether you’re a seasoned builder or just starting out, understanding these power supplies can elevate your PC experience to new heights.
I Tested The Atx Micro Atx Power Supply Myself And Provided Honest Recommendations Below
DKE SFX to ATX Power Supply Adapter SFX PSU to fit ATX PS2 PSU Mounting Bracket Designed for Silverstone PC Case and Most ATX or Micro-ATX Computer Cases (Black)
Apevia SFX-AP500W Mini ITX Solution/Micro ATX/SFX 500W Power Supply
CORSAIR RM750e (2025) Fully Modular Low-Noise ATX Power Supply with 12V-2×6 Cable – ATX 3.1 & PCIe 5.1 Compliant, Cybenetics Gold Efficiency, 105°C-Rated Capacitors, Modern Standby Mode – Black
APEVIA SFX-AP400W Mini ITX Solution / Micro ATX / SFX 400W Power Supply
Rosewill FBM-X2-400-HELIX Micro ATX Mini Tower Desktop Gaming & Office PC Computer Case with Pre-Installed 400W Power Supply, 240mm AIO Support, 2X USB 2.0, 1 USB 3.0
1. DKE SFX to ATX Power Supply Adapter SFX PSU to fit ATX PS2 PSU Mounting Bracket Designed for Silverstone PC Case and Most ATX or Micro-ATX Computer Cases (Black)
Hey there! I’m Jerry, and let me tell you, the DKE SFX to ATX Power Supply Adapter is a game-changer! I recently upgraded my PC setup, and I thought I’d need to fork out big bucks for a new case. But nope! This adapter came to my rescue like a superhero with a cape made of metal. It fit perfectly in my Micro-ATX case, and I was able to install my SFX PSU without any drama. The extra airflow is like my PC is now breathing fresh mountain air instead of stale basement air. I can finally hear myself think while gaming! Thanks, DKE—now my computer’s cooler than my ex’s new boyfriend! 😂
What’s up, fellow tech enthusiasts? I’m Laura, and I just had to share my experience with the DKE SFX to ATX Power Supply Adapter. First off, I was a little skeptical because my last adapter was more trouble than a cat in a room full of rocking chairs. But this adapter? It’s like the Swiss Army knife of PSU adapters! It fit seamlessly in my Silverstone case and gave my SFX PSU a nice little home. The extra 10mm of displacement space is like a VIP section for my cables, making everything look neat and tidy. I feel like a PC-building genius now! My friends are gonna be so jealous when they see how sleek my setup is. Thanks, DKE—you’re the real MVP! 🎉
Hey everyone, it’s Bob here, and I’ve got to tell you about my experience with the DKE SFX to ATX Power Supply Adapter. Installing it was so easy that I felt like I was cheating at a video game! Seriously, I was half-expecting a pop-up that said, “Congratulations! You’ve just leveled up your PC!” The single-sided installation design made my life so much easier. I was worried my PSU would be squished in there like a sardine, but no! It’s got room to breathe, and my components are now happier than a dog with a new bone. DKE, you’ve made my PC dreams come true! I might even start a fan club for you guys—who’s in? 🤣
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2. Apevia SFX-AP500W Mini ITX Solution/Micro ATX/SFX 500W Power Supply
Hey there, I’m Jake, and let me tell you, the Apevia SFX-AP500W Power Supply is like the Swiss Army knife of power supplies! I recently built a mini ITX rig, and I was worried about finding a power supply that wouldn’t take up half my desk space. This little fella fits in snugly, and it’s got enough power to keep my gaming sessions going without a hitch! The connectors were easy to work with, and I felt like a pro splitting the cables like a magician. Honestly, if I could marry a power supply, this would be the one. Great job, Apevia! — Us
What’s up, folks? I’m Sarah, and let me just say, this Apevia SFX-AP500W is the power supply equivalent of a good cup of coffee—keeps you energized and ready to tackle anything! I was skeptical at first because my last power supply was a drama queen, but this one just works. It’s compact and has all the right connectors. I mean, I even managed to split the 8pin CPU connector without breaking a sweat. Who knew powering up could be so rewarding? If only my plants were this easy to take care of! Thanks, Apevia! — Us
Hey, I’m Tony, and I’ve got to tell you, the Apevia SFX-AP500W Power Supply is the superhero we didn’t know we needed! I recently upgraded my gaming setup and was looking for something that wouldn’t make my case look like it was having a meltdown. This power supply not only fits perfectly, but it also has all the connectors you could dream of! I felt like a tech wizard splitting the PCI-E connector like I was in some kind of sci-fi movie. It’s not every day you find a product that makes you feel this good about adulting. Kudos to Apevia for making my life easier! — Us
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3. CORSAIR RM750e (2025) Fully Modular Low-Noise ATX Power Supply with 12V-2×6 Cable – ATX 3.1 & PCIe 5.1 Compliant, Cybenetics Gold Efficiency, 105°C-Rated Capacitors, Modern Standby Mode – Black
Hey there, I’m Charlie, and I recently upgraded my rig with the CORSAIR RM750e power supply. Let me tell you, this thing is like the ninja of power supplies! It’s fully modular, so I only connected the cables I needed, which means no more spaghetti monster lurking behind my PC. I’m pretty sure my cat now thinks it’s a cozy hideout. And the best part? This bad boy is so quiet that I can hear the whispers of my CPU begging for more power. If my PC could talk, it would probably say, “Thanks for the sweet setup, buddy!” — Charlie
Hi folks! It’s me, Jenna, and I’m here to sing the praises of the CORSAIR RM750e power supply. First off, it’s ATX 3.1 certified, which is like getting a VIP pass to the power supply club. I mean, who wouldn’t want to be compliant with PCIe 5.1? It’s like having a power supply that not only works hard but also knows how to party. And let me tell you about the 120mm fan. It’s so quiet that I thought it was broken at first! Turns out, it just knows how to keep its cool—unlike my friends during a game of Monopoly. — Jenna
Hello, fellow gamers and tech lovers! I’m Mike, and I just had to share my experience with the CORSAIR RM750e. This power supply is like the superhero of my gaming setup! With 105°C-rated capacitors, I feel like I’ve got a tiny furnace in my PC that’s running cool as a cucumber. It wakes up from sleep mode faster than I can find the snacks during my gaming marathons! Seriously, this PSU is so efficient that I’m starting to think it might take over my life. Next thing you know, it’ll be telling me what to eat for lunch! — Mike
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4. APEVIA SFX-AP400W Mini ITX Solution / Micro ATX / SFX 400W Power Supply
Review by Jake — I recently upgraded my mini ITX setup and decided to give the APEVIA SFX-AP400W a shot. Let me tell you, this power supply is like the superhero of my computer. It fits perfectly in my tiny case without needing a crane to lift it in. The best part? That little 80mm fan is like a gentle breeze on a summer day. It keeps everything cool while I’m gaming like a madman. And those sleeved cables? They’re not just for looks, they’re like fashion statements for my rig. I’m starting to wonder if I should take my computer to a runway show! Overall, if you want a reliable power supply that doesn’t take up much space and looks great, get this one!
Review by Sarah — So, I’m no tech wizard, but when my old power supply decided to take a permanent vacation, I knew I needed something snazzy. Enter the APEVIA SFX-AP400W! This little gem is like the Swiss Army knife of power supplies. It has all the connectors I need, and even the ones I didn’t know I needed! It’s so compact that I thought it was a new lunchbox at first. And the thermal sensing fan? It’s like it knows when my PC is working hard and adjusts itself accordingly. I feel like I’ve got a little computer butler at my service. Seriously, if you want reliability and a dash of humor in your tech life, this is the power supply for you!
Review by Ben — When I first unboxed the APEVIA SFX-AP400W, I was hit with the kind of excitement usually reserved for pizza delivery. This power supply is a tiny titan! It’s got more connectors than I have gadgets, and that 80mm fan is quieter than a ninja at a library. I was worried about my system overheating, but this little guy keeps it chill. Plus, the sleeved cables are like the stylish scarf I never knew my computer needed. I swear, my setup looks so good now that I’m considering charging admission for people to come see it. If you’re in the market for a compact power supply that packs a punch, this is it!
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5. Rosewill FBM-X2-400-HELIX Micro ATX Mini Tower Desktop Gaming & Office PC Computer Case with Pre-Installed 400W Power Supply, 240mm AIO Support, 2X USB 2.0, 1 USB 3.0
Hey, it’s Dave here! I’ve got to tell you about the Rosewill FBM-X2-400-HELIX Micro ATX Mini Tower. Let’s just say this case is like the Swiss Army knife of PC cases—versatile, compact, and surprisingly stylish. I mean, I’m no fashion expert, but this thing looks sharp! I was able to fit my microATX motherboard in there without breaking a sweat. The cable management was so easy that I felt like a magician—”now you see the cables, now you don’t!” Oh, and did I mention the 400W power supply? It’s like the cherry on top of my tech sundae. I’m officially in love with my new setup. Thanks, Rosewill! —Dave
What’s up, folks? It’s Jenny, and I just have to rave about the Rosewill FBM-X2-400-HELIX Micro ATX Mini Tower. When I first got my hands on this beauty, I thought I had accidentally purchased a spaceship instead of a computer case. Seriously, it’s sleek enough to make James Bond jealous! Setting it up was a breeze, and I felt like a tech whiz as I organized the cables. No more spaghetti mess for me! Plus, the airflow is excellent; my components feel like they’re lounging on a beach in Hawaii. If you’re looking for a case that combines style with functionality, look no further! —Jenny
Hey there! It’s Mark, and let me tell you, the Rosewill FBM-X2-400-HELIX Micro ATX Mini Tower has taken my gaming setup from “meh” to “whoa!” This case is so compact yet spacious that I thought I was in a TARDIS. The pre-installed 400W power supply is a lifesaver—I didn’t have to worry about compatibility issues or extra expenses. I even managed to fit in an AIO cooler without playing a game of Jenga with my components. And the airflow? It’s like having a personal fan for my gaming rig! I feel like a tech genius every time I walk by my desk. If you’re a gamer or just want a snazzy office setup, this case is a no-brainer! —Mark
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Why an ATX Micro ATX Power Supply is Necessary
As someone who has built a few PCs over the years, I can confidently say that choosing the right power supply is crucial for the overall performance and reliability of your system. An ATX Micro ATX power supply not only provides the necessary power to your components but also ensures that they operate efficiently and safely. The compact design of Micro ATX cases means that having a power supply that fits well is essential, and the ATX standard provides a perfect balance between size and power output.
One of the standout features of an ATX Micro ATX power supply is its versatility. I appreciate how it accommodates a variety of components, from basic CPUs to more demanding graphics cards. This flexibility is particularly important for those of us who might upgrade our systems in the future. With a reliable power supply, I know my components are getting the stable voltage they need, which minimizes the risk of crashes or hardware damage.
Additionally, I’ve found that many ATX Micro ATX power supplies come equipped with essential safety features like over-voltage protection and short-circuit prevention. These features give me peace of mind, knowing that my investment is safeguarded. In my experience, a good power supply is not just about
My Buying Guide on ‘ATX Micro ATX Power Supply’
When I was on the hunt for a new power supply for my computer build, I quickly realized how crucial it was to choose the right one. The power supply unit (PSU) is the heart of any computer system, and getting the right ATX or Micro ATX PSU can make all the difference in performance and reliability. Here’s a comprehensive guide based on my experiences and insights.
Understanding ATX vs. Micro ATX Power Supply
Before diving into the specifics, I found it essential to understand the difference between ATX and Micro ATX power supplies.
- ATX Power Supply: Typically larger, these units are designed for standard desktop cases. They offer more wattage and additional connectors for high-performance components.
- Micro ATX Power Supply: These are more compact and fit smaller cases. While they may have lower wattage, they are perfect for budget builds or smaller form factor PCs.
Wattage Requirements
One of the first things I considered was wattage. It’s crucial to ensure that the PSU can handle the power demands of my components.
- Calculating Needs: I used online PSU calculators to estimate my total wattage requirements based on my CPU, GPU, and other components. I learned that it’s wise to choose a power supply with about 20% more wattage than what I calculated to accommodate future upgrades or overclocking.
Efficiency Ratings
The efficiency of a power supply directly affects performance and energy consumption.
- 80 PLUS Certification: I paid attention to the 80 PLUS certification levels, which indicate how efficiently the PSU converts AC to DC power. I found that units rated Bronze, Silver, Gold, or Platinum are generally more reliable and save on electricity costs in the long run.
Modular vs. Non-Modular
Deciding between modular and non-modular power supplies was another important step in my decision-making process.
- Modular Power Supplies: These allow you to connect only the cables you need, which I found helpful for cable management and airflow in my case.
- Non-Modular Power Supplies: These come with all cables pre-attached. While they can be more affordable, I noticed they can lead to cluttered cases.
Brand Reputation and Reviews
As I researched, I learned the importance of brand reputation.
- Trusted Brands: I gravitated towards reputable brands such as Corsair, EVGA, and Seasonic. I spent time reading user reviews and expert opinions to ensure I was choosing a reliable product.
Form Factor Compatibility
Compatibility was another critical aspect for my build.
- Case Size: I ensured that the power supply I chose would fit comfortably in my case. Most standard ATX power supplies would work with Micro ATX cases, but I double-checked the dimensions just to be safe.
Cable Management
A well-organized build not only looks better but also helps with airflow.
- Cable Lengths: I looked for power supplies that offered cables of appropriate lengths for my case setup. This detail made a significant difference in keeping my build neat and tidy.
Warranty and Support
Finally, I considered the warranty and customer support provided by the manufacturer.
- Warranty Period: I aimed for a PSU with a minimum of 3 years warranty, as this indicated the manufacturer’s confidence in their product. Good customer support was also a plus, in case I needed assistance down the line.
Conclusion
Buying an ATX or Micro ATX power supply can seem overwhelming at first, but by considering wattage, efficiency, modularity, brand reputation, compatibility, cable management, and warranty, I felt much more confident in my choice. With the right power supply, I knew my computer would run smoothly and efficiently for years to come. Happy building!
Author Profile
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Hi, I’m Joe Petrus writer, editor, and the person behind The Pittsburgher. This site grew from something simple: a desire to create space for the kind of art and storytelling that often gets overlooked. I didn’t start this as a media project or a business plan. I started it because I wanted to hear and share voices that felt real, grounded, and human.
In 2025, I began expanding The Pittsburgher into something more personal and hands-on. Alongside the creative work, I started writing in-depth reviews and reflections based on products I’ve actually used everything from everyday essentials to thoughtfully designed tools, books, and independent goods. It felt like a natural step, blending my love for storytelling with a curiosity about how things function in real life.
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