Antec GSK GSK850 80+ Gold Full Modular ATX3.1 Power Supply
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Antec GSK850 ATX3.1 850W 80 PLUS Gold · PCIe 5.1 · Fully Modular
The GSK850 is Antec's compact 850W, 80 PLUS Gold unit, formally certified for ATX 3.1 and shipping a PCIe 5.1 16-pin (12+4) GPU cable for current graphics cards. Inside, Antec's PhaseWave design pairs a server-class LLC stage with synchronous rectification and DC-DC conversion, backed by Japanese capacitors. Every cable is fully modular, the 120 mm FDB fan stops entirely at low load, the CircuitShield suite covers eight protections, and the whole unit is just 140 mm deep with a 7-year warranty.
Gaming PCs with a Modern GPU
A native 16-pin PCIe 5.1 cable plus four 6+2-pin PCI-E connectors cover both new and older graphics cards, with 70.6 A (849.6 W) available on the single +12V rail.
Compact & Tidy Builds
At 140 × 150 × 86 mm it is shorter than many 850W units, so it suits a wider range of cases, and full modularity means you install only the cables the build needs.
Power Architecture & Thermal Highlights
Hex-Mesh Grille over a 120 mm FDB Fan
The top view shows the hexagonal mesh that feeds Antec's 120 mm fluid-dynamic-bearing fan, with the GSK GOLD 850W badge on the side. Zero RPM Manager keeps the fan stopped until its thermal sensors call for cooling.
Fully Modular Connector Bay
Every socket is labelled: the 16-pin PCI-E port for the 12V-2x6 GPU cable, four shared PCI-E/CPU sockets, four SATA/Molex sockets, and the motherboard cable split into 18P + 10P connectors.
Rear Panel with HYBRID MODE Switch
The exhaust side carries the AC inlet and main power switch beside a second switch marked HYBRID MODE, the control for the fan's zero-RPM behaviour. Input is 100–240 V, 50–60 Hz with active PFC.
Rated Output on the Label
The rating label states the numbers that matter: +12V 70.6 A for 849.6 W, +3.3V and +5V at 20 A each (100 W combined), and 850 W total, under the ATX3.1 / PCIe5.1 marking and Antec safety model X7000A118XU-24.
Recommended Component Synergy
Processors (CPUs)
Continuous clean power delivery for multi-threaded CPUs under maximum boost.
Graphics Cards (GPUs)
Native 12V-2x6 single-cable feeding RTX 40 & 50 series graphics cards.
Motherboards
Dual EPS 8-pin connectors to feed reinforced VRM power stages.
PC Cases
Compact chassis length ensuring generous cable management clearance.
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Comprehensive Hardware Specifications
| Model | Antec GSK850 ATX3.1 (safety model X7000A118XU-24) |
| Output Capacity | 850W |
| +12V / +3.3V & +5V Combined | 70.6 A · 849.6W / 100W |
| Certification | 80 PLUS Gold |
| Type | ATX 12V 3.1 · PCIe 5.1 |
| Modular | Full-Modular |
| Dimensions | 140 (L) × 150 (W) × 86 (H) mm |
| Input | 100–240 V, 10 A max, 50–60 Hz · Active PFC |
| Motherboard | 1 × 24 (20+4) pin |
| GPU 16-pin | 1 × 16 (12+4) pin PCIe 5.1 12VHPWR |
| CPU | 2 × 8 (4+4) pin |
| PCI-E | 4 × 8 (6+2) pin |
| SATA / Molex | 8 × SATA · 4 × Molex |
| Fan | 120 mm FDB silent fan · Zero RPM Manager |
| Protections | OCP, OVP, UVP, SCP, OPP, OTP, SIP, NLO (CircuitShield) |
| Operating Temperature | 0–40 °C |
| Net Weight | 2.62 kg |
| Warranty | 7 years (Antec) |
