Best PSU for Ryzen 7 5800X3D & RTX 4090
Elite 4K gaming and workstation build; the 4090 provides unmatched performance in all modern titles.
1000W
655W
66%
Enthusiast
🏆 Recommended Power Supplies
Hand-picked for your 1000W target — sorted by overall value.
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
Top-tier build quality with native 12V-2×6 connector for maximum 4090 safety.
Efficiency80+ Gold
FormATX
CablesFull-Modular
Price$179.99
Rosewill VMG 1000W 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
Cost-effective ATX 3.1 choice featuring Japanese capacitors and silent operation.
Efficiency80+ Gold
FormATX
CablesFull-Modular
Price$89.99
CORSAIR RM1000e ATX 3.1 PCIe 5.1 Ready Fully Modular 1000W Power Supply u2013 12V-2×6 Cable Included, Cybenetics Gold Efficiency, 105u00b0C-Rated Capacitors, Modern Standby Mode u2013 Black
Reliable, compact ATX 3.1 unit with included 12V-2×6 cable for easy routing.
Efficiency80+ Gold
FormATX
CablesFull-Modular
Price$152.50
be quiet! Pure Power 12 M 1200W Modular Power Supply | 80 Plusu00ae Gold | ATX 3.1 | PCIe 5.0 GPUs and 6+2 pin connectors | 12VHPWR Cable Included | Silent 120mm be quiet! Fan – BN513 I 10 Year Warranty
Want extra headroom for future GPU upgrades or overclocking? This 1200W unit gives you peace of mind.
Efficiency80+ Gold
FormATX
CablesFull-Modular
Price$179.90
Amazon.com prices as of 03/23/2026 19:57 GMT+0000 —
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📊 Quick Comparison
See the key differences at a glance.
| # | Model | Wattage | Efficiency | Modular | Price |
|---|---|---|---|---|---|
| 1 | 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 | 1000W | 80+ Gold | Full-Modular | $179.99 |
| 2 | Rosewill VMG 1000W 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 | 1000W | 80+ Gold | Full-Modular | $89.99 |
| 3 | CORSAIR RM1000e ATX 3.1 PCIe 5.1 Ready Fully Modular 1000W Power Supply u2013 12V-2×6 Cable Included, Cybenetics Gold Efficiency, 105u00b0C-Rated Capacitors, Modern Standby Mode u2013 Black | 1000W | 80+ Gold | Full-Modular | $149.99 |
| ⬆️ | be quiet! Pure Power 12 M 1200W Modular Power Supply | 80 Plusu00ae Gold | ATX 3.1 | PCIe 5.0 GPUs and 6+2 pin connectors | 12VHPWR Cable Included | Silent 120mm be quiet! Fan – BN513 I 10 Year Warranty Upgrade | 1200W | 80+ Gold | Full-Modular | $179.90 |
🔌 Power Budget
Your system uses 66% of the recommended PSU output — well within the efficient operating range.
1000W (Recommended)
System draw: 655W
Headroom: 345W (30%)
💡 Why 1000W?
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
Use native 12V-2×6 cable to avoid adapter clutter.
Enable Resizable BAR in BIOS for GPU performance gains.
🎯 What This Build Can Do
4K Gaming
Your system can handle 4K gaming at high frame rates with max settings in most modern titles.
Content Creation
Perfect for video editing, 3D rendering, and streaming simultaneously.
Multi-tasking
Run multiple demanding applications simultaneously without performance drops.
🔧 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 4090 — no daisy-chaining.
- Boot-test with side panel open before final assembly.
⚠️ Special Note
Ensure the 12V-2×6 power connector is fully clicked into the GPU.
🔗 Explore More Builds
See PSU recommendations for other CPU + GPU combinations.