# be quiet! SFX POWER 3 450W Power Supply Unit

**URL:** https://aio.lv/en/product--bequiet-bn321--4114461
**Data updated:** 2025-12-02 01:29 (EET)
**Category:** Power Supplies (PSU)
**Manufacturer:** bequiet!
**Manufacturer code:** BN321
**EAN:** 4260052188279
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 73.49 €
**Prices and availability valid until:** 2026-07-12 23:59
**Price without VAT (21%):** 60.74 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--bequiet-bn321--4114461

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 30.06.2026 | free |
| Pickup points | 03.07.2026 | 1.99 EUR |
| Courier delivery to door | 03.07.2026 | 4.99 EUR |

## Summary description

The be quiet! SFX POWER 3 450W power supply unit offers reliable performance with a total power of 450W and peak power of 500W. It features a 20+4 pin ATX motherboard connector and comes with various SATA power cable lengths (300, 450, 600 mm). With an active cooling system and an 8 cm fan, it ensures efficient heat dissipation. Certified with 80 PLUS Bronze, it guarantees energy efficiency. Ideal for PC builds, it operates within an AC input voltage range of 100 - 240V.

## Long description

SFX Power 3 450W is a compact power supply unit by be quiet! designed for mini and media PC systems. It delivers sufficient output to support demanding PCIe graphics cards while balancing power delivery, low noise and dependable operation. The unit is intended for compact builds that require stable performance in a small form factor.
Advantages
The SFX Power 3 450W combines compact dimensions with a power output suitable for many discrete PCIe graphics cards, low operational noise characteristic of be quiet! products, and build quality aimed at reliable continuous operation. Its small size makes it suitable for mini-ITX or other compact chassis where space is limited.
Key specifications
Form factor: SFX
Rated power: 450 W
Compatibility: supports PCIe graphics cards
Manufacturer: be quiet!
How to use
Install the SFX Power 3 450W into an SFX-compatible case following the case and power supply mounting instructions. Connect the main ATX power cable to the motherboard and attach PCIe power connectors to your graphics card as required. Ensure adequate airflow in the compact chassis and observe standard safety procedures when working inside the PC.
Recommendations
Verify case compatibility with SFX power supplies and check graphics card power requirements before installation to ensure the 450W rating meets your system’s needs. Use a case with sufficient ventilation to maintain optimal operating temperatures.

## Specifications

### Power

| Feature | Value |
|---|---|
| Total power | 450 W |
| Efficiency | 85.9 % |
| Power Factor Correction (PFC) type | Active |
| Peak power | 500 W |
| Hold time | 21 ms |
| Power protection features | Over voltage, Short circuit, Over power, Over current, Under voltage |
| Power factor | 0.98 |
| Combined power (+3.3V) | 85 W |
| Combined power (+12V) | 450 W |
| Combined power (+5V) | 85 W |
| Max output current (+3.3V) | 16 A |
| Max output current (+5V) | 16 A |
| Max output current (-12V) | 0.3 A |
| Max output current (+5Vsb) | 2.5 A |
| Input current | 6/2.5 |
| AC input frequency | 50 - 60 |
| AC input voltage | 100 - 240 |
| Max output current (+12V1) | 37.5 A |
| Maximum input current (@110V) | 6 A |
| Maximum input current (@220V) | 2.5 A |

### Ports & interfaces

| Feature | Value |
|---|---|
| Motherboard power connector | 20+4 pin ATX |
| Floppy drive power connector | 1 |
| Number of SATA power connectors | 3 |
| Peripheral (Molex) power connectors (4-pin) | 2 |
| PCI Express power connectors (6+2 pin) | 2 |
| Cabling type | Non-Modular |
| Motherboard power cable length | 350 mm |
| SATA power cable length | 300, 450, 600 |
| Peripheral (Molex) power cable length | 300, 450 |
| PCI Express power cable length | 550 mm |
| Floppy disk drive cable length | 600 mm |
| EPS power connector (4+4 pin) | Yes |

### Performance

| Feature | Value |
|---|---|
| Purpose | PC |
| 80 PLUS certification | 80 PLUS Bronze |
| Mean time between failures (MTBF) | 100000 h |
| Noise level | 33.8 dB |
| Bearing technology | Rifle |
| ATX version | 3.42 |
| EPS version | 2.92 |
| Power supply unit (PSU) form factor | SFX |

### Design

| Feature | Value |
|---|---|
| Fan diameter | 80 mm |
| Number of fans | 1 fan(s) |
| Cooling type | Active |
| On/off switch | Yes |
| Product colour | Black |

### Certificates

| Feature | Value |
|---|---|
| Compliance certificates | RoHS, WEEE |

### Technical details

| Feature | Value |
|---|---|
| Sustainability compliance | Yes |
| Sustainability certificates | ENERGY STAR, ErP |

### Weight & dimensions

| Feature | Value |
|---|---|
| Weight | 0.89 kg |
| Height | 64 mm |
| Width | 125 mm |
| Depth | 100 mm |

### Packaging data

| Feature | Value |
|---|---|
| Package weight | 1240 g |
| Package depth | 75 mm |
| Package height | 207 mm |
| Package width | 197 mm |
| Package type | Box |

### Logistics data

| Feature | Value |
|---|---|
| Shipping (inner) case width | 265 mm |
| Shipping (inner) case length | 457 mm |
| Shipping (inner) case height | 233 mm |
| Shipping (inner) case gross weight | 8190 g |
| Products per shipping (inner) case | 6 pc(s) |
| Harmonized System (HS) code | 84733020 |

### Safety regulation & standards

| Feature | Value |
|---|---|
| Safety | CE, CB, TÜV, CU |

## FAQ

### How much does the be quiet! SFX POWER 3 450W Power Supply cost, and is it available for purchase?

The price is 73.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 34 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 30.06.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay, Installment. All transactions are 100% secure and encrypted.

### Can be quiet! SFX POWER 3 450W Power Supply be purchased with a lease?

Yes, the purchase is available both on credit and with an interest-free installment plan. Learn more about installments and credit options: https://aio.lv/en/payment#b3

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All bequiet! products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized bequiet! service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

### How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: total power, efficiency, motherboard power connector, 80 plus certification, fan diameter, weight, product colour, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

### Where can I download the instructions for be quiet! SFX POWER 3 450W Power Supply?

You can download the instructions in PDF format from the “Instructions” section on the product description page. The file contains complete information about installation, setup, and usage.

## Image

https://aio.lv/img/cache/product/4114461/64793403_large.webp