be quiet!
be quiet! SFX L Quiet Performance Power 600W 80 Plus Gold Quiet Performance Power Supply
Bottom line: The be quiet! SFX L Quiet Performance Power 600W 80 Plus Gold Quiet: 80 PLUS Gold certified, up to 92% efficiency under load; main trade-off: 3-year warranty trails the 10-year coverage rivals offer.
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Pros & Cons
Pros
- ✓ 80 PLUS Gold certified, up to 92% efficiency under load
- ✓ Four PCIe connectors handle multi-GPU or a high-draw card
- ✓ Fully modular cables cut clutter in cramped SFX builds
- ✓ Temperature-controlled 120mm fan stays quiet at low load
- ✓ Includes SFX-to-ATX bracket for mounting in full-size cases
Cons
- ✗ 3-year warranty trails the 10-year coverage rivals offer
- ✗ 600W ceiling rules out 4090/5090-class GPU builds
- ✗ SFX form factor commands a price premium over ATX at 600W
- ✗ 120mm fan is larger than some SFX bays expect without the bracket
SpecPicks Verdict
SpecPicks scored be quiet! SFX L Quiet Performance Power 600W 80 Plus Gold Quiet… using a rating × review-volume × price-fit model applied to published specs and reviews across the power supplies category. be quiet!'s power supplies lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.
Common buyer scenarios for power supplies of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.
Key Features
- 80 plus Gold certification (up to 92% efficiency)
- Multi-gpu support with four PCIe connectors
- Stable LLC, Synchronous Rectifier (SR) and DC-to-DC power conversion
- Modular cables for maximum build flexibility
- Temperature-controlled 120mm high-quality fan
- Sfx-to-atx adapter bracket for usage with larger case Sizes
Full Specifications
| Brand | be quiet! |
|---|---|
| Wattage | 600 watts |
| Fan Size | 12 centimeters |
| Model Name | BN639 |
| Form Factor | SFX |
| Model Number | BN639 |
| Built-In Media | no |
| Connector Type | pcie |
| Cooling Method | Air |
| Number of Fans | 1 |
| Output Wattage | 600 watts |
| Item Dimensions | 5.12 x 4.92 x 2.52 inches |
| Mfr Part Number | BN639 |
| Number of Items | 1 |
| Compatible Devices | Personal Computer |
| Connector Quantity | 4 |
| Power Supply Design | External |
| Warranty Description | 3-year manufacturer’s warranty |
| Maximum Input Voltage | 240 volts_of_alternating_current |
| Minimum Input Voltage | 100 volts_of_alternating_current |
| Full listing title | be quiet! SFX L Quiet Performance Power 600W 80 Plus Gold Quiet Performance Power Supply for Mini ITX Pcs and Compact Gaming Systems | BN639 |
Ready to buy?
be quiet! SFX L Quiet Performance Power 600W 80 Plus Gold Quiet Performance Power Supply for Mini ITX Pcs and Compact Gaming Systems | BN639 is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
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