Best PSU for Ryzen 9 9900X & RTX 4080 SUPER
This build excels at 1440p/4K gaming with high refresh rates and max settings. It's also excellent for demanding productivity tasks, content creation, and streaming.
750W
540W
72%
High-end
🏆 Recommended Power Supplies
Hand-picked for your 750W target — sorted by overall value.
MSI MAG A750GL PCIE5, Fully Modular Compact Gaming 750W Power Supply, 80+ Gold, ATX 3.1 & PCIe 5.1 Ready, Native Dual-Color 12V-2×6 Cable, 10 Year Warranty
MSI MAG A750GL offers ATX 3.1/PCIe 5.1 readiness and a 10-year warranty, ideal for this powerful build.
Efficiency80+ Gold
FormATX
CablesFull-Modular
Price$89.99
CORSAIR RM750e ATX 3.1 PCIe 5.1 Ready Fully Modular 750W Power Supply – 12V-2×6 Cable Included, Cybenetics Gold Efficiency, 105°C-Rated Capacitors, Modern Standby Mode – Black
CORSAIR RM750e provides ATX 3.1/PCIe 5.1, Cybenetics Gold, and 105°C capacitors, ensuring reliable power delivery.
Efficiency80+ Gold
FormATX
CablesFull-Modular
Price$85.99
Rosewill VMG 750W 80+ Gold, ATX 3.0 & 3.1 Compatible, Full Modular Low-Noise Power Supply, PCIe 5.1 12V-2×6 Connector, 100% Japanese Electrolytic Capacitor, 120mm FDB Silent Fan – 5 Year Warranty
Rosewill VMG 750W features ATX 3.1/PCIe 5.1, Japanese capacitors, and a silent fan, suitable for high-end systems.
Efficiency80+ Gold
FormATX
CablesFull-Modular
Price$69.97
Cooler Master MWE Gold 850 V2 Fully Modular Power Supply – 850W 80+ Gold Certified PSU, Dual EPS Connectors, Semi-Fanless Low Noise Design, Flat Black Cables, Reliable ATX Gaming PSU, 5-Year Warranty
Want extra headroom for future GPU upgrades or overclocking? This 850W unit gives you peace of mind.
Efficiency80+ Gold
FormATX
CablesFull-Modular
Price$70.24
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📊 Quick Comparison
See the key differences at a glance.
| # | Model | Wattage | Efficiency | Modular | Price |
|---|---|---|---|---|---|
| 1 | MSI MAG A750GL PCIE5, Fully Modular Compact Gaming 750W Power Supply, 80+ Gold, ATX 3.1 & PCIe 5.1 Ready, Native Dual-Color 12V-2×6 Cable, 10 Year Warranty | 750W | 80+ Gold | Full-Modular | $95.99 |
| 2 | CORSAIR RM750e ATX 3.1 PCIe 5.1 Ready Fully Modular 750W Power Supply – 12V-2×6 Cable Included, Cybenetics Gold Efficiency, 105°C-Rated Capacitors, Modern Standby Mode – Black | 750W | 80+ Gold | Full-Modular | $89.99 |
| 3 | Rosewill VMG 750W 80+ Gold, ATX 3.0 & 3.1 Compatible, Full Modular Low-Noise Power Supply, PCIe 5.1 12V-2×6 Connector, 100% Japanese Electrolytic Capacitor, 120mm FDB Silent Fan – 5 Year Warranty | 750W | 80+ Gold | Full-Modular | $69.98 |
| ⬆️ | Cooler Master MWE Gold 850 V2 Fully Modular Power Supply – 850W 80+ Gold Certified PSU, Dual EPS Connectors, Semi-Fanless Low Noise Design, Flat Black Cables, Reliable ATX Gaming PSU, 5-Year Warranty Upgrade | 850W | 80+ Gold | Full-Modular | $89.99 |
🔌 Power Budget
Your system uses 72% of the recommended PSU output — well within the efficient operating range.
750W (Recommended)
System draw: 540W
Headroom: 210W (30%)
💡 Why 750W?
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 Eco-mode if available on PSU.
Utilize GPU power limits for efficiency.
Optimize CPU power settings in BIOS.
🎯 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
Ensure all modular cables are fully seated into both PSU and components for stability.
🔗 Explore More Builds
See PSU recommendations for other CPU + GPU combinations.