Asrock Steel Legend SL-850G 850W 80 Plus Gold ATX PSU

Asrock Steel Legend SL-850G | 850W ATX 3.1 Gold PSU

The Asrock Steel Legend SL-850G 850W ATX Power Supply Unit, 80 Plus Gold Certified, 120mm Silent Cooling Fan, High Efficiency PSU is built for UK system builders. It targets users who need stable power for high-performance gaming or workstation rigs. Because it is ATX 3.1 compliant, it handles sudden power spikes reliably. Also, the 80 PLUS Gold and Cybenetics Platinum ratings ensure efficient energy use.

Slim Specs Table

Ultra-Quiet Cooling with iCOOL Mode

The unit features a 135mm Fluid Dynamic Bearing fan. This design uses a herringbone structure to minimise noise and extend lifespan. You can toggle the iCOOL mode via a physical switch. When enabled, the fan stays off during low to medium loads. This reduces system noise significantly. However, the fan activates automatically when loads or temperatures rise.

Stable Power with Japanese Capacitors

This PSU uses 105°C Japanese-made capacitors and solid capacitors. This ensures prolonged lifespan and consistent electrical performance. The unit also includes a 5V Boost circuit. It provides extra headroom for stable voltage delivery. Because the components are high-quality, the system remains reliable under continuous use.

ATX 3.1 Compliance and Power Excursion

The Steel Legend SL-850G meets the ATX 3.1 standard. It supports a total power excursion of 200%. This means it can handle瞬时 power spikes from modern graphics cards without shutting down. The native PCIe 12V-2×6 cable ensures a direct connection for the latest GPUs. This reduces the need for adapters and improves signal integrity.

Easy Installation and Visual Feedback

ASRock includes a Dual Colour design on the connectors. The Classic Green connectors help you verify a secure plug-in. This visual cue reduces installation errors. The flat cable design also aids in cable management within tight UK cases. The unit’s dimensions are standard 150mm x 150mm x 86mm. It fits most ATX chassis easily.

Comprehensive Safety and Protection

Safety is a priority with a full suite of protections. These include OCP, SCP, OVP, UVP, OTP, and OPP. These safeguards protect your components during normal and extreme power levels. The unit also features a high MTBF of 100,000 hours at 25°C. This indicates long-term reliability for daily use.

Box contents

• ASRock Steel Legend SL850G Power Supply Unit
• Native PCIe 12V-2×6 Cable
• AC Power Cord (Note: UK plug type not specified; verify before purchase)
• Mounting Screws
• User Manual

Check before you buy

• Confirm the AC power cord includes a UK 3-pin plug, as this is not specified.
• Verify your PC case supports ATX PSUs with 150mm x 150mm x 86mm dimensions.
• Check your motherboard has sufficient EPS 12V (4+4pin) headers for dual CPU cables.
• Ensure your graphics card uses the native 12V-2×6 connector or is compatible with the provided PCIe 5.1 cable.

Frequently Asked Questions

Q: Does the ASRock Steel Legend SL-850G include a UK power cable?

A: The input does not specify the plug type. Please confirm with the retailer that a UK 3-pin plug is included or required.

Q: Is this power supply suitable for NVIDIA RTX 40-series GPUs?

A: Yes, it includes a native 12V-2×6 PCIe 5.1 cable, which is compatible with modern high-end graphics cards.

Q: Can I turn off the fan completely?

A: The iCOOL mode allows the fan to stay off under low loads. However, it will spin up when temperatures or loads increase to protect components.

Q: What is the benefit of Cybenetics Lambda A certification?

A: It certifies ultra-quiet acoustic performance, making this PSU ideal for silent or low-noise builds.

Q: Does this PSU support older motherboards?

A: Yes, it is ATX 3.1 compatible but works with previous ATX standards. The 24-pin motherboard cable is included.

The Consultant’s verdict & warranty

This PSU is ideal for UK gamers and creators building a quiet, efficient system with modern ATX 3.1 hardware. It offers reliable power delivery, easy installation cues, and a 10-year warranty for peace of mind. Covered by the standard Manufacturer Warranty.