Best PSU for Ryzen 9 9950X & RTX 4080 SUPER
Top-tier productivity and 4K ultra gaming build. Handles heavy rendering and ray-tracing effortlessly.
850W
590W
69%
Enthusiast
🏆 Recommended Power Supplies
Hand-picked for your 850W target — sorted by overall value.
MSI MAG A850GL PCIE5, Fully Modular Compact Gaming 850W Power Supply, 80+ Gold, ATX 3.1 & PCIe 5.1 Ready, Native Dual-Color 12V-2×6 Cable, 10 Year Warranty
Native ATX 3.1 support with dual-color 12V-2×6 cable for safety.
Efficiency80+ Gold
FormATX
CablesFull-Modular
Price$118.99
CORSAIR RM850e ATX 3.1 PCIe 5.1 Ready Fully Modular 850W Power Supply u2013 12V-2×6 Cable Included, Cybenetics Gold Efficiency, 105u00b0C-Rated Capacitors, Modern Standby Mode u2013 Black
High-quality Cybenetics Gold efficiency with native PCIe 5.1 support.
Efficiency80+ Gold
FormATX
CablesFull-Modular
Price$124.99
Thermaltake GF1 Fully Modular ATX 850W Power Supply – 80 Plus Gold – Ultra Quiet – Zero RPM, PS-TPD-0850FNFAGU-P
Reliable legacy unit but requires adapters for the 4080 Super.
Efficiency80+ Gold
FormATX
CablesFull-Modular
Price$95.99
CORSAIR RM1000x ATX 3.1 PCIe 5.1 Ready Fully Modular 1000W Power Supply u2013 Low-Noise, Cybenetics Gold Efficiency, Native 12V-2×6 Connector u2013 Black
Want extra headroom for future GPU upgrades or overclocking? This 1000W unit gives you peace of mind.
Efficiency80+ Gold
FormATX
CablesFull-Modular
Price$179.99
Amazon.com prices as of 03/23/2026 09:15 GMT+0000 —
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📊 Quick Comparison
See the key differences at a glance.
| # | Model | Wattage | Efficiency | Modular | Price |
|---|---|---|---|---|---|
| 1 | MSI MAG A850GL PCIE5, Fully Modular Compact Gaming 850W Power Supply, 80+ Gold, ATX 3.1 & PCIe 5.1 Ready, Native Dual-Color 12V-2×6 Cable, 10 Year Warranty | 850W | 80+ Gold | Full-Modular | $118.50 |
| 2 | CORSAIR RM850e ATX 3.1 PCIe 5.1 Ready Fully Modular 850W Power Supply u2013 12V-2×6 Cable Included, Cybenetics Gold Efficiency, 105u00b0C-Rated Capacitors, Modern Standby Mode u2013 Black | 850W | 80+ Gold | Full-Modular | $124.99 |
| 3 | Thermaltake GF1 Fully Modular ATX 850W Power Supply – 80 Plus Gold – Ultra Quiet – Zero RPM, PS-TPD-0850FNFAGU-P | 850W | 80+ Gold | Full-Modular | $95.49 |
| ⬆️ | CORSAIR RM1000x ATX 3.1 PCIe 5.1 Ready Fully Modular 1000W Power Supply u2013 Low-Noise, Cybenetics Gold Efficiency, Native 12V-2×6 Connector u2013 Black Upgrade | 1000W | 80+ Gold | Full-Modular | $179.99 |
🔌 Power Budget
Your system uses 69% of the recommended PSU output — well within the efficient operating range.
850W (Recommended)
System draw: 590W
Headroom: 260W (30%)
💡 Why 850W?
Power Calculation
CPU + GPU draw, plus ~100W for motherboard, RAM, fans, and storage.
30% Headroom
Extra capacity absorbs transient power spikes, keeps efficiency in the sweet spot, and leaves room for future upgrades.
80 Plus Efficiency
We only recommend certified PSUs. Higher ratings mean less wasted energy, lower heat, and quieter fans.
🌿 Power Efficiency Tips
Enable PBO for optimized CPU power scaling.
Undervolt the GPU to reduce heat and power draw.
🎯 What This Build Can Do
Gaming
Suitable for modern games with good performance based on your system configuration.
Productivity
Great for office work, multitasking, and everyday computing tasks.
Content Creation
Can handle basic video editing and content creation workflows.
🔧 Installation Guide
Quick Checklist
- Mount the PSU with its fan aligned to your case airflow.
- Only connect cables you actually need (modular PSUs).
- Use dedicated PCIe power cables for NVIDIA GeForce RTX 4080 SUPER — no daisy-chaining.
- Boot-test with side panel open before final assembly.
⚠️ Special Note
Use native 12V-2×6 cables for the GPU to ensure clean power delivery.
🔗 Explore More Builds
See PSU recommendations for other CPU + GPU combinations.