Antec CSK850 PRO 850W ATX 3.1 Power Supply

Antec CSK850 PRO | 850W ATX 3.1 PSU for High-Performance PCs

The Antec CSK850 PRO is an 850 W semi-modular power supply built for modern gaming and high-performance PCs. Compliant with ATX 3.1 and PCIe 5.1 ready, it delivers stable, efficient power to the latest graphics cards through its native 12V 2×6 (12VHPWR) connector. With 80 Plus Bronze efficiency, advanced CircuitShield™ protection, and a quiet 120 mm fan, it ensures reliable operation and easy installation for demanding builds.

Technical Specifications

Built for Next-Gen GPUs with PCIe 5.1 Support

The CSK850 PRO includes a native 16-pin (12+4) PCIe 5.1 connector, ready for the latest high-power graphics cards. This ensures direct, stable delivery of up to 600 W to your GPU without the need for adapters. If you’re upgrading to a next-gen RTX 4090 or similar, this PSU removes compatibility concerns and supports future hardware.

Advanced CircuitShield™ Protection for Reliable Operation

Antec’s CircuitShield™ suite covers all major protection types: OCP, OVP, UVP, SCP, OPP, OTP, SIP, and NLO. This multi-layer safety system guards against electrical faults, overloads, and overheating, keeping both your components and data safe. In practice, this means fewer crashes, longer hardware life, and peace of mind during intensive workloads.

Semi-Modular Design for Cleaner Builds

With only essential cables hardwired, the CSK850 PRO’s semi-modular layout lets you attach only the cables you need. This reduces clutter inside your case, improves airflow, and makes routing easier—especially in compact ATX builds. The included cable set covers all major connections, from ATX main to PCIe and storage.

Quiet Cooling with Intelligent Thermal Control

A 120 mm silent fan with Antec’s thermal manager adjusts speed based on system load. Under light use, the fan stays quiet or even stops, while under heavy gaming or rendering, it ramps up smoothly to maintain safe temperatures. This balance between silence and cooling is ideal for both work and play.

Box contents

• Antec CSK850 PRO 850 W power supply
• Required modular and fixed cables
• Mounting screws
• User manual and warranty card

Check before you buy

• Confirm your case supports ATX 12V 3.1 PSUs (140 x 150 x 86 mm)
• Verify your GPU needs a 12VHPWR connector for full compatibility
• Ensure your system’s total power draw is within 850 W
• Check that your region’s power grid matches 200–240 V AC input

Buyer FAQs

The bottom line

The Antec CSK850 PRO is a future-ready 850 W PSU ideal for gamers and creators running high-end GPUs and multi-core CPUs. Its PCIe 5.1 support, comprehensive protection, and quiet operation make it a reliable backbone for any modern ATX build. Covered by the applicable manufacturer warranty, it offers both performance and peace of mind.