# Power supply COUGAR GST 850W ATX3.1 80 PLUS Gold, 850 W, 20+4 pin ATX, 120 mm fan, black

**URL:** https://aio.lv/en/product--silentiumpc-gst850--12038269
**Data updated:** 2026-03-12 16:47 (EET)
**Category:** Power Supplies (PSU)
**Manufacturer:** SilentiumPC
**Manufacturer code:** GST850
**EAN:** 4710483778186
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 127.99 €
**Prices and availability valid until:** 2026-07-20 23:59
**Price without VAT (21%):** 105.78 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--silentiumpc-gst850--12038269

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 16.07.2026 | free |
| Pickup points | 21.07.2026 | 1.89 EUR |
| Courier delivery to door | 21.07.2026 | 4.99 EUR |

## Summary description

COUGAR Power Supply GST 850W ATX3.1 is an ATX-format PSU designed for desktop PCs, delivering 850 W total power with 80 PLUS Gold efficiency (approx. 91%). It supports a 20+4 pin ATX motherboard connector, active cooling via a 120 mm fan, and universal 100–240 V AC input at 50/60 Hz. Key features include SATA power cable lengths up to 450 mm, black finish, compliance with CE, EAC, FCC, RoHS, TÜV and UKCA standards, and a compact form factor for system builds and upgrades.

## Long description

COUGAR GST 850W ATX3.1 80 PLUS Gold is a non-modular ATX power supply designed for desktop PCs and compact system builds. Delivering 850 W of continuous power with approximately 91% conversion efficiency, this PSU follows the ATX 3.1 and PCIe 5.1 guidelines and includes a native PCIe 12V-2X6 (12+4 pin) connector for next-generation graphics cards. The unit incorporates a 120 mm Hydro Dynamic Bearing (HDB) fan with temperature-controlled speed, 105°C Japanese capacitors for stable standby power and tightly regulated LLC + DC-DC + Tri-Sense outputs, and supports universal 100–240 V AC input at 50/60 Hz.
Advantages
The GST 850W combines high conversion efficiency with compliance to modern ATX 3.1 and PCIe 5.1 requirements to provide stable and reliable power delivery for contemporary systems. A native 12+4-pin connector and long cables reduce the need for adapters and simplify GPU installation. The 120 mm HDB fan and refined blade design focus airflow and minimize vibration, delivering quiet operation across typical workloads. Built with 105°C Japanese capacitors and designed to operate reliably at up to 40°C ambient temperature, this PSU emphasizes consistent voltage regulation and durability.
Suitable for
 Gaming desktops with mid-to-high power GPUs that require a 12+4-pin PCIe connector
 Workstations running multi-core CPUs and graphics-intensive applications
 System upgrades where ATX 3.1 compatibility and high efficiency are required
 Compact PC builds needing a non-modular, space-efficient PSU with reliable cables
Key specifications
 Total power: 850 W
 Efficiency: approximately 91% (80 PLUS Gold)
 Motherboard connector: 20+4 pin ATX
 PCIe connector: native 12V-2X6 (12+4-pin) for PCIe 5.1 GPUs
 Cooling: 120 mm HDB fan with temperature-controlled speed
 Input voltage: 100–240 V AC, 50/60 Hz
 Operating ambient temperature: up to 40°C
 Capacitors: 105°C Japanese capacitors for standby power
 Voltage regulation: LLC + DC-DC + Tri-Sense design with tight ±3% regulation
 Colour and form: black finish, compact ATX form factor
 Weight: 2.22 kg
 Fan diameter: 120 mm
How to use
Install the PSU into a compatible ATX case following the case manufacturer’s instructions and ensure the unit is securely fastened. Connect the 20+4 pin ATX cable to the motherboard and use the native 12+4-pin PCIe cable for compatible GPUs; ensure connectors are fully seated. Route SATA and peripheral cables to storage drives and peripherals, keeping cables tidy to maintain airflow. Before first power-up, verify input voltage selection if present and confirm all connections are correct. Power on the system and monitor voltages in BIOS or with system monitoring tools to confirm stable operation.
Usage recommendations
For optimal performance and longevity, use the GST 850W with systems whose peak power draw remains within the PSU’s rated capacity including expected power spikes. Maintain adequate case airflow and avoid obstructing the 120 mm fan intake. Periodically check cable connections and dust levels; clean the fan and vents as needed. When building with high-end GPUs, use the native 12+4-pin connector provided and avoid adapters that could introduce poor contacts.

## Specifications

### Power

| Feature | Value |
|---|---|
| Total power | 850 W |
| Efficiency | 91 % |
| Power protection features | Under voltage, Short circuit, Overheating, Over voltage, Over power, Over current |
| Combined power (+3.3V) | 120 W |
| Combined power (+12V) | 850 W |
| Combined power (+5V) | 120 W |
| Combined power (-12V) | 3.6 W |
| Combined power (+5Vsb) | 15 W |
| Max output current (+3.3V) | 20 A |
| Max output current (+12V) | 70.8 A |
| Max output current (+5V) | 20 A |
| Max output current (-12V) | 0.3 A |
| Max output current (+5Vsb) | 3 A |
| Input current | 12 - 6 |
| AC input frequency | 50/60 |
| AC input voltage | 100 - 240 |

### Ports & interfaces

| Feature | Value |
|---|---|
| Motherboard power connector | 20+4 pin ATX |
| PCI Express connector | Yes |
| Number of SATA power connectors | 8 |
| Peripheral (Molex) power connectors (4-pin) | 4 |
| CPU power connector (4+4 pin) | Yes |
| PCI Express power connectors (6+2 pin) | 4 |
| Cabling type | Non-Modular |
| Motherboard power cable length | 550 mm |
| SATA power cable length | 450, 150 |
| CPU power cable length | 600 mm |
| Peripheral (Molex) power cable length | 450, 150 |
| PCI Express power cable length | 550 mm |
| PCI Express power connectors (12+4 pin) | 1 |

### Performance

| Feature | Value |
|---|---|
| Purpose | PC |
| 80 PLUS certification | 80 PLUS Gold |
| Bearing technology | HDB |
| ATX version | 3.1 |
| Power supply unit (PSU) form factor | ATX |

### Design

| Feature | Value |
|---|---|
| Fan diameter | 120 mm |
| Number of fans | 1 fan(s) |
| Cooling type | Active |
| On/off switch | Yes |
| Product colour | Black |

### Certificates

| Feature | Value |
|---|---|
| Compliance certificates | CE, EAC, Federal Communications Commission (FCC), RoHS, TÜV mark, UKCA |

### Weight & dimensions

| Feature | Value |
|---|---|
| Weight | 2.22 kg |
| Height | 86 mm |
| Width | 150 mm |
| Depth | 140 mm |

### Operational conditions

| Feature | Value |
|---|---|
| Operating relative humidity (H-H) | 20 - 85 |
| Storage temperature (T-T) | -40 - 70 |
| Operating temperature (T-T) | 10 - 40 |
| Storage relative humidity (H-H) | 5 - 95 |

### Packaging data

| Feature | Value |
|---|---|
| Package weight | 3020 g |
| Package depth | 290 mm |
| Package height | 105 mm |
| Package width | 215 mm |

## FAQ

### How much does the COUGAR GST 850W ATX3.1 power supply cost, and is it available for purchase?

The price is 127.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 33 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 16.07.2026 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 COUGAR GST 850W ATX3.1 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 SilentiumPC 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 SilentiumPC 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 COUGAR GST 850W ATX3.1 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

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