Best PSU for Ryzen Threadripper PRO 9955WX & RTX 5090
This build is an extreme workstation/gaming powerhouse, capable of handling the most demanding tasks, 8K gaming, AI/ML, and professional content creation with ease.
1500W
1050W
70%
Enthusiast
🏆 Recommended Power Supplies
Hand-picked for your 1500W target — sorted by overall value.
CORSAIR HX1500i (2025) Fully Modular Ultra-Low Noise ATX Power Supply with 12V-2×6 Cable – ATX 3.1 & PCIe 5.1 Compliant, Cybenetics Platinum Efficiency, Fluid Dynamic Bearing Fan – Black
Excellent ATX 3.1/PCIe 5.1 compliance with 12V-2×6, ultra-low noise, and Cybenetics Platinum for this high-end system.
Efficiency80+ Gold
FormATX
CablesFull-Modular
Price$341.35
be quiet! Straight Power 12-1500w Modular Power Supply | 80 Plus Platinum ATX 3.1 Compliant | for PCIe 5.0 GPUs and GPUs with 6+2 pin connectors | Silent 135mm Fan | BN518
Robust ATX 3.1/PCIe 5.0 support, quiet operation, and 80 Plus Platinum efficiency make it a strong contender.
Efficiency80+ Gold
FormATX
CablesNon-Modular
Price$260.91
CORSAIR HX1500i Shift Fully Modular ATX Power Supply – Built-in iCUE Link System Hub, Dual Native 12V-2×6 Cable, ATX 3.1 & PCIe 5.1, Side-Mounted Connectors, Cybenetics Platinum – Black
Innovative side-mounted connectors and iCUE Link integration simplify cable management for this powerful setup.
Efficiency80+ Gold
FormATX
CablesFull-Modular
Price$449.99
CORSAIR HX1500i (2025) Fully Modular Ultra-Low Noise ATX Power Supply with 12V-2×6 Cable – ATX 3.1 & PCIe 5.1 Compliant, Cybenetics Platinum Efficiency, Fluid Dynamic Bearing Fan – Black
Want extra headroom for future GPU upgrades or overclocking? This 1600W unit gives you peace of mind.
Efficiency80+ Gold
FormATX
CablesFull-Modular
Price$341.35
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📊 Quick Comparison
See the key differences at a glance.
| # | Model | Wattage | Efficiency | Modular | Price |
|---|---|---|---|---|---|
| 1 | CORSAIR HX1500i (2025) Fully Modular Ultra-Low Noise ATX Power Supply with 12V-2×6 Cable – ATX 3.1 & PCIe 5.1 Compliant, Cybenetics Platinum Efficiency, Fluid Dynamic Bearing Fan – Black | 1500W | 80+ Gold | Full-Modular | $341.35 |
| 2 | be quiet! Straight Power 12-1500w Modular Power Supply | 80 Plus Platinum ATX 3.1 Compliant | for PCIe 5.0 GPUs and GPUs with 6+2 pin connectors | Silent 135mm Fan | BN518 | 1500W | 80+ Gold | Non-Modular | $260.91 |
| 3 | CORSAIR HX1500i Shift Fully Modular ATX Power Supply – Built-in iCUE Link System Hub, Dual Native 12V-2×6 Cable, ATX 3.1 & PCIe 5.1, Side-Mounted Connectors, Cybenetics Platinum – Black | 1500W | 80+ Gold | Full-Modular | $449.99 |
| ⬆️ | CORSAIR HX1500i (2025) Fully Modular Ultra-Low Noise ATX Power Supply with 12V-2×6 Cable – ATX 3.1 & PCIe 5.1 Compliant, Cybenetics Platinum Efficiency, Fluid Dynamic Bearing Fan – Black Upgrade | 1600W | 80+ Gold | Full-Modular | $341.35 |
🔌 Power Budget
Your system uses 70% of the recommended PSU output — well within the efficient operating range.
1500W (Recommended)
System draw: 1050W
Headroom: 450W (30%)
💡 Why 1500W?
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
Utilize power-saving modes in OS and GPU drivers.
Ensure proper case airflow for optimal component cooling.
Monitor power consumption with software like HWiNFO.
🎯 What This Build Can Do
Extreme Workstation
Unrivaled performance for professional content creation, scientific simulations, and complex data analysis.
Ultimate Gaming Rig
Experience all games at max settings, high frame rates, and resolutions, including future titles.
AI/ML Development
Powerhouse for training large AI models, deep learning research, and high-performance computing tasks.
🔧 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 5090 — no daisy-chaining.
- Boot-test with side panel open before final assembly.
⚠️ Special Note
Consider the physical dimensions of the PSU and cable routing for a clean build.
🔗 Explore More Builds
See PSU recommendations for other CPU + GPU combinations.