Antec CSK850 PRO 850W Semi-Modular ATX 3.1 Power Supply, PCIe 5.1 Ready with 12V 2x6 Connector, 80 Plus Bronze Certified, Quiet

The Antec CSK850 PRO is an 850W semi-modular power supply designed to meet the demands of modern gaming and high-performance computing systems. 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. With 80 Plus Bronze certification, it delivers up to 90% efficiency, ensuring a cooler and quieter system. The power supply features a full suite of industrial-grade protections under Antec's CircuitShield™ technology, providing safety and reliability. Its compact design, quiet 120mm fan with intelligent thermal control, and semi-modular cables make installation easy and improve system airflow. Backed by a 5-year warranty, the CSK850 PRO is a future-proof choice for demanding PC builds.

Full Specifications

Model:
CSK850 PRO

MPN:
0-761345-20075-2

Form Factor:
ATX 12V 3.1 semi-modular

Wattage:
850W 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:
120mm silent fan with thermal manager fan speed control

PFC:
Active PFC

Power Good Signal:
100–150ms

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

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 600W)
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