The Seasonic Platinum Fanless 520 W (a.k.a. SS-520FL) is, as the name suggests, a fanless power supply with the 80 Plus Platinum certification, targeted to users building a quiet computer. It also comes with a fully modular cabling system. Let’s see if this new release deserves our recommendation.

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Figure 1: Seasonic Platinum Fanless 520 W power supply

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Figure 2: Seasonic Platinum Fanless 520 W power supply

The Seasonic Platinum Fanless 520 W is 6.3” (160 mm) deep.

The modular cabling system from this power supply has 10 connectors: two for the main motherboard power connector, four for video card and ATX12V/EPS12V connectors, and four for peripheral and SATA connectors. This power supply comes with the following cables:

• Main motherboard cable with a 20/24-pin connector, 23.6” (60 cm) long
• One cable with two ATX12V connectors that together form an EPS12V connector, 25.2” (64 cm) long
• Two cables, each with one six/eight-pin connector for video cards, 23.6” (60 cm) long
• One cable with four SATA power connectors, 15.7” (40 cm) to the first connector, 4.7” (12 cm) between connectors
• One cable with two SATA power connectors, 11.8” (30 cm) to the first connector, 4.7” (12 cm) between connectors
• One cable with three peripheral power connectors, 15.7” (40 cm) to the first connector, 4.7” (12 cm) between connectors
• One cable with two peripheral power connectors, 11.8” (30 cm) to the first connector, 4.7” (12 cm) between connectors
• One adapter to convert a standard peripheral power connector into a floppy disk drive power connector

All wires are 18 AWG, which is the minimum recommended gauge.

The number of connectors is outstanding for a 520 W power supply.

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Figure 3: Cables

Let’s now take an in-depth look inside this power supply.