Silverstone Strider Platinum PS-ST55F-PT 550 W power supply

Compact 140 mm ATX power supply

The SilverStone Strider Platinum PS-ST55F-PT is a fully modular 550 W unit built to the ATX12V and EPS12V standard. Its 140 mm depth helps it fit into smaller cases while still delivering 80 PLUS Platinum efficiency between 89% and 92% across 20% to 100% load. A single +12V rail provides all 12 V power for simpler cable routing.

Check case depth and connector needs

Verify that your chassis can accommodate a 140 mm deep power supply and that the 20+4 pin motherboard, 8/4 pin EPS, two 6+2 pin PCIe and eight SATA connectors match your component list. The unit accepts 90 to 264 V input at 47 to 63 Hz, so confirm your local mains voltage falls in that range. Ensure the 550 W maximum output covers the total draw of your planned hardware.

Suits efficient small-form-factor builds

This supply suits builders who want Platinum-grade efficiency and fully modular cabling in a compact ATX footprint, especially where semi-fanless operation below 20% load is valued. It is not for systems whose peak demand exceeds 550 W, nor for builds that require more than two PCIe power cables or more than eight SATA power connections.