be quiet! System Power 9 400W

A 400W unit with 80+ Bronze efficiency certification and non-modular cabling. It uses the ATX form factor — confirm your case lists ATX support. 400W covers mainstream builds with a modest GPU. A dependable power supply protects everything downstream, and efficiency tiers are a decent proxy for overall build quality.

Use the PlanMyPC system builder to verify it works alongside your other components and to watch live retailer pricing. Warranty coverage follows be quiet!'s standard policy — confirm regional terms on the listing. Scroll down for the complete spec table; the builder's compatibility checker will warn you about any conflicts with components you have already picked.