Best 800W ATX Power Supplies for Stronger, Cooler PC Builds
Choosing a reliable 800-watt-class ATX power supply helps ensure stable performance for gaming rigs, workstations, and dense multi-GPU setups. This guide reviews five strong options around the 800-watt mark, highlighting efficiency, modularity, cooling, and reliability. Each model is built to deliver consistent power while keeping noise and heat in check. Use the buying guide below to compare features and pick the best fit for your system.
| Product | Brand | Wattage | Efficiency | Modularity |
|---|---|---|---|---|
| 800W Power Supply 800W | TF SkywindIntl | 800W | 80 Plus Gold | Non-modular |
| Apevia ATX-JP800W Jupiter 800W | Apevia | 800W | 80 Plus Bronze | Non-modular |
| Montech Century II 850W | Montech | 850W | 80 Plus Gold & Cybenetics Platinum | Fully Modular |
| NZXT C850 Gold Core | NZXT | 850W | 80 Plus Gold | Fully Modular |
| Thermaltake Toughpower GT 750W | Thermaltake | 750W | 80 Plus Gold | Non-modular |
800W Power Supply 800W — TF SkywindIntl
This 800W ATX PSU delivers a stable continuous output with 87%+ efficiency under typical loads. It comes in a standard ATX form factor (150x140x85mm) and is designed for gaming PCs, desktops, and servers. A 120mm ultra-quiet hydraulic bearing fan helps maintain lower noise and longer service life, while 100% Japanese capacitors add reliability and durability.
Key Specifications
- Wattage: 800W, non-modular
- Efficiency: 80 Plus Gold (typical)
- Form factor: ATX
- Cooling: 120mm hydraulic bearing fan
- Capacitors: 100% Japanese
Apevia ATX-JP800W Jupiter 800W
Apevia’s ATX-JP800W Jupiter offers 800W with Bronze efficiency and Active PFC. It includes a 135mm auto-thermally controlled fan and a broad connector set, including PCIe, SATA, and 20/24-pin main power. It supports single 12V output for higher power usage and ships with 100% reliability-enhancing components.
Key Specifications
- Wattage: 800W, non-modular
- Efficiency: 80 Plus Bronze
- Cooling: Auto-Thermally Controlled 135mm fan
- Connectors: 20/24-pin, PCIe, SATA, Peripheral, Floppy
- Warranty: 3 years
Montech Century II — 850W
Montech Century II provides an 850W high-end option with 80 Plus Gold and Cybenetics Platinum efficiency. It is fully modular and ATX 3.1 compatible with 12V-2×6 PCIe 5.1 readiness. The build is designed for demanding gaming systems and multi-GPU configurations, with a 10-year warranty supporting long-term usage.
Key Specifications
- Wattage: 850W, fully modular
- Efficiency: 80 Plus Gold & Cybenetics Platinum
- Standards: ATX 3.1, PCIe 5.1 ready
- Warranty: 10 years
- Connector support: 12V-2×6 PCIe
NZXT C850 Gold Core — 850W
NZXT’s C850 Gold Core is an 850W ATX 3.1 power supply with 80 Plus Gold efficiency and Cybenetics Platinum certification. It is fully modular for tidy builds and is designed to support next-gen GPUs via PCIe 5.1 readiness. The power delivery emphasizes stability and low noise, suitable for quiet high-performance systems.
Key Specifications
- Wattage: 850W, fully modular
- Efficiency: 80 Plus Gold
- Certification: Cybenetics Platinum
- Standards: ATX 3.1, PCIe 5.1
- Noise: Low profile under typical loads
Thermaltake Toughpower GT 750W
The Thermaltake Toughpower GT 750W is a robust option near 800W, featuring ATX 3.1 compatibility and 80 Plus Gold efficiency with Smart Zero Fan technology to minimize noise during low-load operations. While rated at 750W, it remains a viable choice for builds that slightly under- or over-provision wattage for efficiency and headroom.
Key Specifications
- Wattage: 750W
- Efficiency: 80 Plus Gold
- Cooling: Smart Zero Fan
- Standards: ATX 3.1, PCIe ready
- Warranty: Typically listed by model
Buying Guide: Key Purchase Considerations
When selecting an 800W-class ATX PSU, several factors influence long-term performance and ease of use. Battery-free reliability (quality capacitors and components) and a robust warranty are essential for protecting your system. Consider these angles:
- Efficiency and Certification: Look for 80 Plus Gold or higher to minimize heat and electricity usage. Certifications like Cybenetics Platinum can offer quieter operation and improved tolerances.
- Modularity: Fully modular units reduce cable clutter and improve airflow, especially in compact or high-performance builds.
- Rail Stability: A good 12V rail design ensures stable power delivery to CPUs and GPUs under load. Active PFC and solid overcurrent protection contribute to safety and longevity.
- Cabling and Connectors: Ensure the included PCIe, EPS12V, and SATA connectors match your motherboard and GPUs. Dual or multiple PCIe connectors may be needed for high-end GPUs.
- Cooling and Noise: Larger or high-quality silent fans, or smart fan curves, help maintain comfortable acoustics in living spaces or workstations.
- Warranty and Support: A longer warranty (5–10 years) reflects confidence in durability and provides coverage for component failures.
- System Compatibility: For ATX 3.1 and PCIe 5.1 readiness, verify GPU and motherboard compatibility, especially for newer builds with PCIe 5.0/5.1 needs.
These options collectively cover a range of budgets and priorities—from non-modular mainstream units to fully modular, high-efficiency models suited for modern multi-GPU setups. Consider your chassis space, planned GPU upgrades, and expected load to pick the best 800W-class PSU for your build.