New, in its sealed box, the Seasonic CORE GX-550, 550W 80+ Gold Full-Modular, Fan Control in Silent and Cooling Mode Power Supply. Seasonic is the premier manufacturer of power supplies.
80 Plus Gold certified, for maximum energy savings
Fully Modular cabling
ATX12V specifications - actual dimensions: 140mm (w) x 150mm (l) x 86mm (h)
SMART and SILENT FAN CONTROL: Seasonic Smart and Silent Fan Control technology(S2FC) optimizes the fan speed according to the needs of the system to create a more silent and comfortable experience
Japanese capacitors
Full specs on Seasonics website: https://seasonic.com/core-gx/
4.7 stars on Amazon: https://www.amazon.com/Seasonic-Full-Modular-Control-Application-SSR-550LX/dp/B08VZN29FT?th=1