ASRock Steel Legend SL-850G 850W 80+ Gold Modular PSU
ASRock
ASRock Steel Legend SL-850G 850W 80+ Gold Modular PSU
The ASRock Steel Legend SL-850G is an 850W modular power supply designed for mainstream gaming and workstation builds. It combines 80 PLUS Gold efficiency with Cybenetics Platinum rating and Lambda A+ acoustic certification, delivering both energy savings and quiet operation without sacrificing performance.
Why this product
80 PLUS Gold efficiency
Certified for high energy conversion, reducing power waste and electricity costs during daily operation.
Less than 20 dB average noise
Cybenetics Lambda A+ certified, this supply operates quietly enough for silent-focused builds even under moderate loads.
Fully modular cables
Only connect the connectors you need, making cable management cleaner and airflow less obstructed in your case.
ATX3.1 and PCIe5.1 ready
Future-proofed for next-generation graphics cards and CPU architectures with native 12V-2x6 connector support.
iCOOL intelligent fan control
Fan stays off during light workloads to reduce noise and heat, automatically activating when the system demands more power.
- Wattage850W
- Efficiency80 PLUS Gold
- ModularFully Modular
- Noise LevelLess than 20 dB (average)
- Warranty10 Years
- Dimensions150mm × 150mm × 86mm
- SKUASR-746
- EAN4710483949074
- Works with all standard ATX power distribution, including modern graphics cards with PCIe5.1 power requirements.
- Fully modular design fits cases of various sizes and supports custom cable configurations.
- Fan operation mode (iCOOL ON or OFF) can be toggled: OFF mode provides continuous cooling but increases noise, ON mode reduces noise but relies on load-dependent activation.
Best for
- Builders prioritising quiet operation
- Mid-range gaming and workstation systems requiring 850W capacity
- Cable-conscious builds needing clean case aesthetics
- Users concerned with electricity costs and heat output
- Future-focused systems targeting ATX3.1 or PCIe5.1 platforms
Trade-offs
- High-end dual-GPU or extreme overclocking systems requiring more than 850W continuous output.
- Compact ITX builds where the 150 × 150 × 86mm footprint may not fit.
- Budget builds where a lower-wattage or non-modular PSU is sufficient.
The Steel Legend series power supply unit offers options of 1200W, 1000W, 850W, 750W, and 650W, available in "Steel Black" and "Steel White" ideal for mainstream systems.
Certified for 80 PLUS Gold efficiency and Cybenetics Platinum rating, along with LAMBDA A+/A acoustic certification, it ensures outstanding energy performance. The Cybenetics certification on the packaging has been updated. Some earlier units may not show the badge. For the latest certification details, please visit the official Cybenetics website. Product specifications and performance remain unchanged.
The Steel Legend series power operates at less than 20 dB of noise on average, earning the prestigious Cybenetics Lambda A+ certification. This recognition underscores the Steel Legend series' outstanding noise control performance, making it an exceptional choice for users seeking ultra-quiet operation.
With ASRock Classic Green connectors, users can easily see if the connector has been plugged properly.
- iCOOL Mode ON: The power supply runs more efficiently. The fan stays off during low to medium loads, reducing noise and improving energy efficiency. The fan only activates when the load or temperature increases.
- iCOOL Mode OFF: The fan runs continuously, regardless of load. This may increase noise slightly but provides consistent cooling and better performance under heavy loads.
General
| Brand | ASRock |
|---|---|
| Model | SL-850G |
| Wattage | 850W |
| Color | Steel Black |
Efficiency & Certification
| 80 PLUS Certification | GOLD |
|---|---|
| Cybenetics Efficiency Rating | PLATINUM |
| Cybenetics Acoustic Rating | LAMBDA A+ |
Power Rails & Connectors
| +12V Rail | 70.9A |
|---|---|
| +5V Rail | 20A |
| +3.3V Rail | 20A |
| Combined +3.3V & +5V | 120W |
| Native Connector | 12V-2x6 |
| Cable Design | Fully Modular |
Design & Features
| Fan | 135mm Striped Axial FDB Fan |
|---|---|
| Noise Level | Less than 20 dB (average) |
| Capacitors | 100% Highly Reliable Japanese Capacitors |
| ATX Standard | ATX3.1 & PCIe5.1 Ready |
| Dimensions (L × W × H) | 150mm × 150mm × 86mm |
| Warranty | 10 Years |
Shipping
All our products are shipped from the United Kingdom within 24 to 48 hours of purchase. See our Shipping and Returns page for full details.
Returns
- Tech Syndicate offers a full money-back guarantee on all purchases made in our store. If you are not satisfied with your purchase, we will provide a full refund, no questions asked.
- Refunds are available within 45 days of delivery.
- After the 45-day period you are no longer eligible for a refund, so we encourage you to try the product within the first few weeks to make sure it fits your needs.