A standard SFX power supply measures 125 mm wide × 63.5 mm high × 100 mm deep. SFX-L keeps the same width and height but is 130 mm long—30 mm longer than the standard SFX dimensions in Corsair’s comparison. Check the exact PSU’s dimensions against your case’s stated clearance; the form-factor name alone does not guarantee fit.
What are the standard SFX power supply dimensions?
The nominal standard SFX envelope is 125 mm wide × 63.5 mm high × 100 mm deep. Dimension order varies across specifications: Intel’s SFX12V design guide presents a standard physical outline, while Corsair lists dimensions in length × width × height order. Corsair’s SFX measurement is therefore 100 × 125 × 63.5 mm (length × width × height). Labeling each axis avoids confusing the 100 mm length with the 125 mm width. Intel’s PSU Design Guide, version 2.1, lists SFX12V mechanical outlines; its standard profile appears in section 14.7, with the 60 mm mechanical outline in Figure 14-9. Intel’s guide page is dated May 1, 2024, and notes that a newer version may be available.
How do SFX and SFX-L dimensions compare?
The main dimensional difference is length. Corsair lists SFX-L as 130 × 125 × 63.5 mm and standard SFX as 100 × 125 × 63.5 mm, with both values expressed as length × width × height. Thus, SFX-L is 30 mm longer while retaining the same width and height in that comparison. Corsair’s SFX and SFX-L comparison and its PSU form-factor guide provide these measurements.
| Form factor | Length | Width | Height |
|---|---|---|---|
| SFX | 100 mm | 125 mm | 63.5 mm |
| SFX-L | 130 mm | 125 mm | 63.5 mm |
These are the dimensions in Corsair’s comparison, not a guarantee that every product carrying either label has identical external measurements. Intel’s guide also contains more than one SFX12V package outline, including different fan or package arrangements. For a purchase, use the exact PSU model’s published dimensions rather than treating a standards drawing or form-factor label as the product specification.
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#1 Best Overall
- Fully Modular PSU: Reliable and efficient low-noise power supply with fully modular cabling, so you only have to connect the cables your system build needs.
- ATX 3.1 Certified: Compliant with the ATX 3.1 power standard, supporting the PCIe Gen 5.0 platform and resisting transient power spikes.
- Low-Noise Fan: Equipped with a premium 92mm FDB (Fluid Dynamic Bearing) fan, the PSU ensures efficient and quiet thermal performance.
- Native 12V-2x6 Connector: SP Series V2 Gold features a two-tone 12V-2x6 power cable with visual cues for safe connections, enhancing clarity and reliability for high-performance 50/40 series graphics cards.
- Upgraded Standby Power & Reliable Power Backed by 10-Year Hardware Protection: The SP Series V2 Gold features an upgraded 5VSB (standby) rail, increasing its current capacity from 2.5A to 3A, better supporting today's power-hungry peripherals.
How to check whether an SFX or SFX-L PSU fits your case
- Find the case’s PSU specification. Look for its supported PSU form factors and maximum PSU length in the case maker’s documentation.
- Check the exact PSU model. Read the manufacturer’s dimensions and identify which number is length or depth; do not compare unlabeled dimension sequences.
- Compare the length first. A 130 mm SFX-L unit needs more length clearance than a 100 mm SFX unit in Corsair’s comparison. Confirm the case supports the particular unit’s size rather than assuming SFX-L will fit wherever SFX does.
- Check installation and cable space. Account for cable clearance or room needed to mount the unit if the case documentation specifies it. The PSU body fitting within the listed limit does not by itself establish that installation access or cable routing will work.
This comparison addresses physical dimensions only. It does not determine whether a PSU is electrically suitable for a build or establish its wattage, cooling, noise, or thermal performance.
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Rank #3
- Fully Modular PSU: Reliable and efficient low-noise power supply with fully modular cabling, so you only have to connect the cables your system build needs.
- ATX 3.1 Certified: Compliant with the ATX 3.1 power standard, supporting the PCIe Gen 5.0 platform and resisting transient power spikes.
- Low-Noise Fan: Equipped with a premium 92mm FDB (Fluid Dynamic Bearing) fan, the PSU ensures efficient and quiet thermal performance.
- Native 12V-2x6 Connector: SP Series V2 Gold features a two-tone 12V-2x6 power cable with visual cues for safe connections, enhancing clarity and reliability for high-performance 50/40 series graphics cards.
- Upgraded Standby Power & Reliable Power Backed by 10-Year Hardware Protection: The SP Series V2 Gold features an upgraded 5VSB (standby) rail, increasing its current capacity from 2.5A to 3A, better supporting today's power-hungry peripherals.
Rank #2
- Compact Power Solution: APEVIA SFX-AP500W 500W Power Supply designed for Mini ITX Solution, Micro ATX, and SFX form factor systems
- Comprehensive Connector Options: Includes 1 x 20+4pin Main Power, 1 x 8pin 12V(P4+4), 1 x 6/8pin PCIe, 3 x SATA, and 2 x 4pin Molex connectors for versatile compatibility
- Space-Saving Dimensions: Measures 125mm x 100mm x 63.5mm (4.9 inches x 3.94 inches x 2.5 inches) - L x W x H, designed for small form factor builds
- Proper Installation Required: The power supply will not power on simply by connecting the power cord to both the power supply and wall outlet. Ensure that all the power supply cables are properly connected to the PC for it to power on
- Flexible CPU Power Connection: The 8pin CPU connector can be split apart to become a 4+4 by pushing one end of the 4pin down and the other end of the 4pin up for motherboards that require a 4pin power
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