# be quiet! System Power 9 500W cm, Modular, 80 Plus Bronze, Power Supply

- Category: Power Supply
- Brand: be quiet!
- Model: System Power 9
- Part number: BN301
- Price (US): currently unavailable
- Price last checked: 2026-08-06
- Rating: 4.7/5 from 1181 Amazon reviews
- Warranty: 1 year
- Product page: https://buildmypc.net/component-details/power-supply/be-quiet-system-power-9-bn301/

## Specifications

| Spec | Value |
| --- | --- |
| Brand | be quiet! |
| Model | System Power 9 |
| Power | 500 W |
| Efficiency | 80+ Bronze |
| Color | Black |
| Form Factor | ATX |

## Key Features

- Rock-solid stability with two strong 12V-rails
- DC-to-DC technology for tight voltage regulation
- Multi-GPU support with two PCIe connectors
- Temperature-controlled 120mm fan reduces system noise
- Stand-by drain of less than 0.15 watts
- 80 PLUS Bronze efficiency (up to 89%)
- Semi-modular, high-quality sleeved and flat cables
- All-in-one cable with S-ATA, HDD and FDD connectors
- Complete suite of top safety features
- Meets latest Intel C6/C7, ErP and Energy Star 6.1 guidelines

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