# be quiet! Straight Power 11 Platinum 550W, BN640, fully modular, power supply

- Category: Power Supply
- Brand: be quiet!
- Model: BN640
- Part number: BN640
- Price (US): currently unavailable
- Price last checked: 2026-08-05
- Rating: 4.8/5 from 774 Amazon reviews
- Warranty: 5 years
- Product page: https://buildmypc.net/component-details/power-supply/be-quiet-bn640/

## Specifications

| Spec | Value |
| --- | --- |
| Brand | be quiet! |
| Model | BN640 |
| Power | 550 W |
| Efficiency | 80+ Platinum |
| Color | Black |
| Form Factor | ATX |

## Key Features

- 80 PLUS Platinum efficiency (up to 93 8%)
- Virtually inaudible Silent Wings 3 135mm fan
- Funnel-shaped fan opening of the PSU case for high airflow intake
- Wire-free inside the PSU on the DC side for enhanced cooling and longevity
- Modular cables for maximum build flexibility

---

Source: BuildMyPC (https://buildmypc.net/) — free PC parts compatibility checker. Prices update daily. As an Amazon Associate, BuildMyPC earns from qualifying purchases.