ASRock Steel Legend SL-850P 850W ATX Power Supply 80 Plus Platinum Fully Modular

PSU Tier A • ASRock • $ 119.99

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Power Your Dream Build with the ASRock Steel Legend SL-850P

The ASRock Steel Legend SL-850P is a premium 850-watt ATX power supply designed for enthusiasts who demand both performance and reliability. With an 80 Plus Platinum certification, it delivers up to 94% efficiency at 230V AC, reducing heat and energy waste. Its fully modular design ensures a clean, cable-managed interior, while the included PCIe 5.0 12VHPWR connector future-proofs your system for the latest graphics cards.

Key Features

80 Plus Platinum Certified: Achieves up to 92% efficiency at 115V AC and 94% at 230V AC, lowering your electricity bill and keeping components cool.
Fully Modular Cabling: Install only the cables you need, making building and cable management effortless.
PCIe 5.0 Ready: Includes a native 16-pin 12VHPWR connector for next-gen GPUs, delivering up to 600W to your graphics card.
Silent 120mm FDB Fan: Fluid Dynamic Bearing fan with semi-fanless mode ensures whisper-quiet operation under low loads and efficient cooling under stress.
Comprehensive Protections: OVP, UVP, OPP, OCP, OTP, and SCP safeguard your valuable components.

Performance and Reliability

The SL-850P provides a single +12V rail capable of delivering 70.8A, ensuring stable power even during intense gaming or content creation sessions. Its robust 160mm ATX form factor fits most mid-tower and full-tower cases. The included cable set covers all essential connections: 24-pin ATX, dual EPS12V for high-end motherboards, four PCIe 6+2 connectors, and eight SATA connectors for storage drives.

Who Is It For?

This power supply is perfect for gamers, PC builders, and professionals who are assembling a high-performance system with an RTX 40-series or Radeon RX 7000-series GPU. It's also an excellent choice for those who value energy efficiency and quiet operation. Whether you're building a new rig or upgrading an existing one, the ASRock Steel Legend SL-850P offers the reliability and headroom you need.

Why Choose ASRock Steel Legend?

ASRock's Steel Legend series is known for its durability and aesthetic appeal, featuring a sleek black and white design with a subtle steel-patterned fan grille. The SL-850P is backed by a 7-year warranty, giving you peace of mind. With its combination of efficiency, modularity, and modern connectivity, this PSU is a smart investment for any serious PC enthusiast.

Key Specifications

Connector Type: ATX12V / EPS12V / PCIe 5.0 (12VHPWR) (fully modular)

Output Wattage: 850 Watts continuous (single +12 V rail)

Form Factor: ATX (160 × 150 × 86 mm)

Wattage: 850 W

Cooling Method: Air‑cooled, 120 mm Fluid Dynamic Bearing fan with semi-fanless / silent mode

Design: Full Modular

Protections: OVP, UVP, OPP, OCP, OTP, SCP

Efficiency: 80 PLUS Platinum certified (≈ 92 % @115 VAC / ≈ 94 % @230 VAC)

Cable Set: 1X 24‑pin ATX motherboard 2X 8‑pin EPS12V (4+4) CPU connector 4X 6+2‑pin PCIe 1X 16‑pin (12VHPWR) PCIe 5.0 8X SATA 4X Four‑Pin Peripheral (Molex) 1X Floppy‑drive adapter

Detailed Parameters

Rated Power Output in Watts:: 850
Form Factor:: ATX, EPS

Where to Buy

Amazon

Pros

80 Plus Platinum efficiency (up to 94%)
Fully modular design for clean builds
Native PCIe 5.0 12VHPWR connector
Silent semi-fanless operation
Comprehensive protections and 7-year warranty

Cons

160mm length may not fit compact cases
No RGB lighting (if desired)
Premium price compared to Gold units

Frequently Asked Questions

Is the ASRock Steel Legend SL-850P compatible with RTX 4090?

Yes, it includes a native 16-pin 12VHPWR connector that can deliver up to 600W, making it fully compatible with RTX 4090 and other high-end GPUs.

Does this power supply support multi-GPU setups?

Yes, it has four 6+2-pin PCIe connectors, allowing you to run two GPUs that require two 8-pin connectors each, though most modern setups use a single powerful GPU.

What is the fan noise level?

The fan operates in semi-fanless mode, staying off under low loads (below ~40% load) for silent operation. Under heavy loads, it spins up but remains quiet thanks to the fluid dynamic bearing.

Is the SL-850P compatible with ATX 3.0?

While it is not officially ATX 3.0 certified, it includes the 12VHPWR connector and meets the power delivery requirements for modern GPUs. It also supports EPS12V for CPUs.

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