Antec CSK850 PRO 850W Semi-Modular Power Supply

The Antec CSK850 PRO delivers 850W of continuous power for modern gaming and high-performance PC builds. This semi-modular ATX 3.1 power supply features native PCIe 5.1 support with a 12V 2x6 (12VHPWR) connector capable of delivering up to 600W to the latest graphics cards, eliminating the need for adapters.

ATX 3.1 Standard with PCIe 5.1 Compatibility

Built to the ATX 3.1 specification, the CSK850 PRO handles power excursion loads from next-generation GPUs. The native 16-pin (12+4) PCIe 5.1 connector provides clean, direct power delivery to RTX 40-series and future graphics cards. Additional connectors include one 24-pin ATX main, two 8-pin (4+4) CPU EPS, four 8-pin (6+2) PCIe, six SATA, and three Molex.

80 Plus Bronze Efficiency

Certified 80 Plus Bronze, this PSU achieves up to 90% efficiency under typical loads, reducing energy waste and heat generation. Active PFC ensures stable power delivery across the 200-240V AC input range. The compact 140 x 150 x 86mm form factor fits standard ATX cases while weighing approximately 1.95kg.

CircuitShield Protection Suite

Antec's CircuitShield technology provides comprehensive protection with 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), and NLO (No Load Operation). These safeguards protect your components from electrical anomalies.

Quiet Cooling System

The 120mm silent fan uses thermal manager fan speed control, adjusting RPM based on internal temperature and load. This intelligent cooling keeps noise levels low during typical use while ramping up only when necessary. The fan operates reliably within the 0-40°C temperature range.

Semi-Modular Design

Semi-modular cabling allows you to connect only the cables you need, reducing clutter and improving airflow inside your case. The fixed cables include essential connections while peripheral cables can be attached as required for your specific build.

Certifications and Warranty

The CSK850 PRO carries TUV, CB, RCM, CE, BIS, UKCA, and KC certifications, meeting international safety and performance standards. Antec backs this power supply with a 5-year warranty, providing long-term reliability for your investment.

The Antec CSK850 PRO is an 850 W semi-modular power supply designed for modern gaming and high-performance PCs. Compliant with the ATX 3.1 standard and PCIe 5.1 ready, it supports the latest graphics cards through its native 12V 2x6 (12VHPWR) connector. Featuring 80 Plus Bronze efficiency and advanced CircuitShield™ protection, this PSU ensures reliable, efficient, and safe power delivery. Its compact design, quiet 120 mm fan with intelligent thermal control, and semi-modular cables make installation easy and improve system airflow. Backed by a 5-year warranty, it is a future-proof choice for demanding PC builds.

Full Specifications

Model:
CSK850 PRO

MPN:
0-761345-20071-4

Form Factor:
ATX 12V 3.1 semi-modular

Wattage:
850 W continuous

Efficiency:
80 Plus Bronze (up to ~90%)

ATX Standard:
ATX 3.1

PCIe Support:
PCIe 5.1 native 12V 2x6 GPU connector

Protection Features (CircuitShield™):
OCP, OVP, UVP, SCP, OPP, OTP, SIP, NLO

Cooling:
120 mm silent fan with thermal manager fan speed control

PFC:
Active PFC

Power Good Signal:
100–150 ms

Input Voltage:
200–240 V AC, 12 A max, 50–60 Hz

Dimensions (L x W x H):
140 x 150 x 86 mm

Net Weight:
Approximately 1.95 kg

Connectors:
1 x 24-pin ATX main
1 x 16-pin (12+4) PCIe 5.1 (12VHPWR, up to 600 W)
2 x 8-pin (4+4) CPU EPS
4 x 8-pin (6+2) PCIe
6 x SATA
3 x Molex

Operating Temperature:
0–40 °C

Certifications:
TUV, CB, RCM, CE, BIS, UKCA, KC

Warranty:
5 years

• Wattage: 850W
• Size/Version: ATX 3.1
• Modular: Semi
• SATA Connections: 6
• Certification: Bronze
• Colour: Black