Best PSU for AMD Ryzen 7 9800X3D and NVIDIA GeForce RTX 4090
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NVIDIA GeForce RTX 4090
Configuration Analysis
System Performance Assessment
This system, featuring the Ryzen 9800X3D and RTX 4090, is designed for uncompromising performance. Expect to run any game at maximum settings with high refresh rates, handle demanding content creation tasks with ease, and enjoy smooth multitasking. It's well-suited for 4K gaming, VR, and professional workloads.
Recommended Power Supplies
CORSAIR RM1000x Fully Modular Low-Noise ATX Power Supply – ATX 3.1 Compliant – PCIe 5.1 Support – Cybenetics Gold Efficiency – Native 12V-2×6 Connector – Black
CORSAIR RM1000e (2025) Fully Modular Low-Noise ATX Power Supply with 12V-2×6 Cable – ATX 3.1 & PCIe 5.1 Compliant, Cybenetics Gold Efficiency, 105°C-Rated Capacitors, Modern Standby Mode – Black
The RM1000e (2025) is perfect. Its 1000W and ATX 3.1/PCIe 5.1 compliance ensure reliable power delivery for your 4090 and 9800X3D.
ASUS TUF Gaming 1000W Gold (1000 Watt, ATX 3.0 Compatible Fully Modular Power Supply, 80+ Gold Certified, Military-Grade Components, Dual Ball Bearing, Axial-tech Fan, PCB Coating, 10 Year Warranty)
The ASUS TUF 1000W Gold provides ample, stable power for your 4090 and 9800X3D, with headroom and a long warranty for peace of mind.
Comparison Table
| Model | Wattage | Efficiency | Form Factor | Modularity | Price | Best For |
|---|---|---|---|---|---|---|
| CORSAIR RM1000x Fully Modular Low-Noise ATX Power Supply – ATX 3.1 Compliant – PCIe 5.1 Support – Cybenetics Gold Efficiency – Native 12V-2×6 Connector – Black | 1000W | 80+ Gold | ATX | Full-Modular | $169.99 | Overall Value |
| CORSAIR RM1000e (2025) Fully Modular Low-Noise ATX Power Supply with 12V-2×6 Cable – ATX 3.1 & PCIe 5.1 Compliant, Cybenetics Gold Efficiency, 105°C-Rated Capacitors, Modern Standby Mode – Black | 1000W | 80+ Gold | ATX | Full-Modular | $169.99 | Energy Efficiency |
| ASUS TUF Gaming 1000W Gold (1000 Watt, ATX 3.0 Compatible Fully Modular Power Supply, 80+ Gold Certified, Military-Grade Components, Dual Ball Bearing, Axial-tech Fan, PCB Coating, 10 Year Warranty) | 1000W | 80+ Gold | ATX | Full-Modular | $163.99 | Energy Efficiency |
Why This Wattage?
Power Calculation
The recommended PSU wattage is calculated based on the total power draw of your CPU (AMD Ryzen 7 9800X3D) and GPU (NVIDIA GeForce RTX 4090), plus approximately 100W for other components like motherboard, memory, and storage devices.
Extra Headroom
We add an additional 30% headroom to ensure optimal efficiency, handle power spikes, and allow for future upgrades. This ensures your system runs stable and your PSU operates in its optimal efficiency range.
Efficiency Standards
We recommend power supplies with 80 Plus certification, which represents higher energy efficiency and more reliable performance. Power supplies are most efficient at 50-60% load, so having adequate headroom is important.
Power Efficiency Tips
Utilize NVIDIA's GeForce Experience to optimize game settings for a balance between visual quality and power consumption.
Enable AMD's Eco Mode on the CPU to reduce its power draw during less intensive tasks, lowering overall system power consumption.
Consider undervolting the GPU slightly. The RTX 4090 often has headroom for undervolting without significant performance loss, improving efficiency.
Special Installation Note
Ensure the 12V-2×6 (formerly 12VHPWR) cable is fully seated and properly connected to the RTX 4090. A loose connection can lead to instability or damage, so apply firm and even pressure until it clicks into place.
Usage Scenarios
AAA Gaming
Effortlessly runs the latest games at maximum settings, 4K resolution, and high refresh rates, ensuring a smooth and immersive experience.
Video Editing
Handles complex video editing projects with ease, including 8K footage, color grading, and visual effects rendering, significantly speeding up workflows.
AI Development
Powers AI model training and development, allowing for faster iteration and experimentation with large datasets and complex algorithms.
Installation Tips
Position Properly
Most cases have a dedicated PSU bay at the bottom. Ensure the PSU fan is facing down if your case has bottom ventilation, allowing it to draw cool air from outside.
Cable Management
With modular PSUs, connect only the cables you need. Route cables behind the motherboard tray when possible for better airflow and cleaner appearance.
Proper Connections
Ensure all power connectors are fully seated and locked. The NVIDIA GeForce RTX 4090 will require dedicated PCIe power connectors from the PSU.
Test Before Completing
Before fully closing your case, connect the essential components and test that your system boots correctly with the new power supply.
The RM1000x is perfect! It's got the headroom and native 12V-2×6 for your 4090, plus gold efficiency for that power-hungry 9800X3D.