Short answer: if your case only fits standard SFX, get the Corsair SF600. If it takes SFX-L, the ASUS ROG Loki SFX-L 750W Platinum is our all-around pick. The Silverstone SX800-LTI makes sense only if you accept its 3-year warranty.
A standard ATX PSU won't fit most ITX cases. That is why SFX and SFX-L exist, each with its own size and wattage trade-offs.
SFX vs SFX-L: The Size Difference That Matters
- Width and height: the same on both.
- Length: SFX-L is roughly 30mm longer.
- What the length buys: room for a larger, quieter fan and higher wattage.
Some ITX cases only clear standard SFX and can't fit the longer SFX-L body. Check your case's PSU bracket spec before buying either.
Corsair SF600: Entry SFX at 600W Platinum
The Corsair SF600 is the smallest footprint here.
- Wattage: 600W
- Efficiency: 80 PLUS Platinum
- Depth: 125mm, standard SFX
- Fan: 92mm, semi-passive below 30% load
- GPU connectors: standard PCIe 6+2-pin, no native 12V-2x6
- Price: $139.99
The catches: a current GPU with the newer connector needs Corsair's adapter cable. The small 92mm fan is louder under load.
Buy it if: you run a single mid-range GPU in a tight ITX case where only standard SFX fits.
Skip it if: your case takes SFX-L; the ASUS ROG Loki SFX-L 750W Platinum is quieter and has native 12V-2x6.
ASUS ROG Loki SFX-L 750W Platinum: The SFX-L Step Up
The ASUS ROG Loki SFX-L 750W Platinum uses the longer body to fit a bigger fan.
- Wattage: 750W
- Efficiency: 80 PLUS Platinum
- Form factor: SFX-L
- Fan: 120mm
- GPU connectors: native 12V-2x6
- Price: $170
That is a meaningful wattage step up over the SF600 for a modest price increase. The catch: your case must support SFX-L length.
Buy it if: your case supports SFX-L and you want a quieter fan, native 12V-2x6 and more headroom.
Skip it if: your case only fits standard SFX; get the Corsair SF600.
Silverstone SX800-LTI: Titanium-Tier Flagship
The Silverstone SX800-LTI pushes SFX-L to its limit.
- Wattage: 800W
- Efficiency: 80 PLUS Titanium
- Form factor: SFX-L
- Warranty: 3 years
In our view, that much capacity and efficiency in a body this compact is uncommon. The catch is the warranty. 3 years is shorter than the Corsair or ASUS units here, and well below the 7-to-10-year terms increasingly standard at this price. Factor that in before paying the Titanium premium.
Buy it if: you want the most wattage and Titanium efficiency in an SFX-L body.
Skip it if: warranty length matters to you; the ASUS ROG Loki SFX-L 750W Platinum is the safer SFX-L buy.
What to Check Before Buying
- Length: confirm your case supports SFX-L before buying one. The extra 30mm won't fit every ITX chassis.
- Wattage: match it to your actual GPU and CPU draw rather than over-buying.
- Connector: check for a native 12V-2x6 connector if you pair it with a current-generation graphics card.
Our Pick
The Corsair SF600 when case space is the tightest constraint and only standard SFX fits. The ASUS ROG Loki SFX-L 750W Platinum when your case supports SFX-L.
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Which ITX case are you building in, and does its bracket take SFX-L? Tell us at hello@consumercarts.com.