Antec CSK850 Pro ATX 3.1 Bronze SMPS – High-Efficiency, Next-Gen Ready 850W Power Supply

The Antec CSK850 Pro ATX 3.1 Bronze SMPS is engineered for builders who demand reliable power delivery, next-generation hardware compatibility, and long-lasting durability. Featuring ATX 3.1 & PCIe 5.1 support, 80 Plus Bronze efficiency, semi-modular cabling, and Antec’s trusted CircuitShield™ safety protections, this 850W power supply delivers exceptional performance for high-end gaming PCs, workstations, and productivity rigs.

Designed with a compact form factor, the CSK850 Pro ATX3.1 fits into a wide range of cases while offering robust electrical stability, improved airflow, and quiet operation—making it an ideal choice for modern PC builds powered by the latest NVIDIA® GeForce RTX™ 40 Series GPUs.

Advanced ATX 3.1 & PCIe 5.1 Compatibility for Next-Gen GPUs

The CSK850 Pro is fully compliant with the ATX 3.1 standard, ensuring superior reliability, power stability, and efficiency.
It includes a PCIe 5.1 (12V-2x6) GPU cable capable of delivering up to 600W, supporting the newest graphics cards including:

• NVIDIA® GeForce RTX™ 40 Series

• High-end PCIe 5.1 compatible GPUs

This makes the PSU future-ready and optimized for performance-demanding components.

80 Plus Bronze Certified for Efficient & Cooler Operation

With up to 90% efficiency, the CSK850 Pro reduces wasted energy, lowers heat output, and promotes quieter PC operation.
The 850W continuous power ensures stable performance under heavy loads, making it perfect for gaming, rendering, and productivity systems.

Enhanced Safety with CircuitShield™ Industrial-Grade Protections

Antec’s CircuitShield™ delivers complete protection to your PC through a suite of advanced safeguards:

• OCP – Over Current Protection

• OVP – Over Voltage Protection

• UVP – Under Voltage Protection

• SCP – Short Circuit Protection

• OPP – Over Power Protection

• OTP – Over Temperature Protection

• SIP – Surge & Inrush Protection

• NLO – No Load Operation Support

These ensure long-term reliability and peace of mind in any operating environment.

Quiet & Durable Cooling with 120mm Silent Fan

The built-in 120mm silent fan keeps your PSU cool with minimal noise.
It features:

• High airflow performance

• Long operational lifespan

• Efficient heat dissipation

Paired with Thermal Manager Technology, the fan intelligently adjusts RPM to maintain ideal temperatures and reduce noise.

Semi-Modular Cabling for Cleaner Builds & Better Airflow

The semi-modular design allows you to use only the cables you need, helping to:

• Minimize clutter

• Improve airflow inside the case

• Simplify cable management

• Enhance overall system aesthetics

Perfect for clean builds and compact cases.

Compact Size for Wider Case Compatibility

Measuring only 140mm in length, the CSK850 Pro ATX3.1 fits into a wide variety of cases, including compact ATX builds, without compromising performance or cable routing options.

Backed by Antec’s 5-Year Warranty

Antec offers a 5-year warranty along with responsive customer support—reflecting their confidence in product durability and long-term reliability.