Best PSU for AMD Ryzen 9 9950X3D and NVIDIA GeForce RTX 4090
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NVIDIA GeForce RTX 4090
Configuration Analysis
System Performance Assessment
This system is a powerhouse, capable of handling any modern game at maximum settings with high refresh rates, including ray tracing. It will also excel in demanding content creation tasks such as video editing, 3D rendering, and scientific simulations. Expect smooth performance and minimal bottlenecks in virtually all applications.
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 provides ample, stable power for your high-end 9950X3D and RTX 4090, with headroom and future-proofed PCIe 5.1 support.
ARESGAME AGT Series 1000W Power Supply, 80+ Gold Certified, Fully Modular, FDB Fan, Compact 140mm Size, 10 Year Warranty, ATX Gaming Power Supply
The ARESGAME 1000W Gold is perfect! Fully modular, compact, and with a 10-year warranty, it's rock-solid for your 4090/9950X3D beast.
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 | $209.99 | 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 |
| ARESGAME AGT Series 1000W Power Supply, 80+ Gold Certified, Fully Modular, FDB Fan, Compact 140mm Size, 10 Year Warranty, ATX Gaming Power Supply | 1000W | 80+ Gold | ATX | Full-Modular | $109.99 | Energy Efficiency |
Why This Wattage?
Power Calculation
The recommended PSU wattage is calculated based on the total power draw of your CPU (AMD Ryzen 9 9950X3D) 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
Enable Eco mode or similar features in the PSU BIOS or software to reduce fan noise and power consumption when the system is idle or under light load.
Optimize game settings for visual fidelity vs. frame rate. Lowering some settings slightly can significantly reduce power draw without a noticeable impact on visual experience.
Consider undervolting the CPU and/or GPU. This can reduce power consumption and temperatures while maintaining stable performance.
Special Installation Note
Given the RTX 4090 and Ryzen 9 9950X3D's high power demands, use dedicated PCIe power cables from the PSU to the GPU, avoiding daisy-chaining to ensure stable power delivery and prevent potential issues. Verify the 12V-2×6 connector is fully seated.
Usage Scenarios
Ultra Gaming
Experience any game at maximum settings, 4K resolution, and high refresh rates with ray tracing enabled for unparalleled visual fidelity.
Professional Creation
Effortlessly handle demanding tasks like 8K video editing, complex 3D rendering, and large-scale simulations with blazing fast speeds.
AI Development
Train large AI models and run complex machine learning algorithms quickly and efficiently, leveraging the GPU's parallel processing power.
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! Its ATX 3.1 and PCIe 5.1 support handle your 4090 and 9950X3D with headroom to spare, plus it's efficient.