Best PSU for AMD Ryzen 9 9900X and NVIDIA GeForce RTX 5080
+
NVIDIA GeForce RTX 5080
Configuration Analysis
System Performance Assessment
This system, featuring a Ryzen 9 9900X and RTX 5080, is designed for extreme performance. Expect to run all modern games at maximum settings with high refresh rates at 4K resolution, handle demanding content creation tasks with ease, and enjoy seamless multitasking. This configuration is well-suited for VR and other graphically intensive applications.
Recommended Power Supplies
CORSAIR RM850e (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
Thermaltake GF1 (2024) Fully Modular ATX 850W Power Supply – 80 Plus Gold – Ultra Quiet – Zero RPM, PS-TPD-0850FNFAGU-P
The Thermaltake GF1 850W Gold is perfect: headroom for the 9900X and RTX 5080, plus fully modular for a clean build.
MSI MAG A850GL PCIE 5.1 & ATX 3.1 Gaming Power Supply – Full Modular – 80 Plus Gold Certified 850W – Compact Size – ATX PSU – 10 Year Warranty
The MSI MAG A850GL is perfect! Its ATX 3.1 & PCIe 5.1 support future-proofs your RTX 5080 and Ryzen 9 9900X build.
Comparison Table
| Model | Wattage | Efficiency | Form Factor | Modularity | Price | Best For |
|---|---|---|---|---|---|---|
| CORSAIR RM850e (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 | 850W | 80+ Gold | ATX | Full-Modular | $129.99 | Overall Value |
| Thermaltake GF1 (2024) Fully Modular ATX 850W Power Supply – 80 Plus Gold – Ultra Quiet – Zero RPM, PS-TPD-0850FNFAGU-P | 850W | 80+ Gold | ATX | Full-Modular | $99.99 | Energy Efficiency |
| MSI MAG A850GL PCIE 5.1 & ATX 3.1 Gaming Power Supply – Full Modular – 80 Plus Gold Certified 850W – Compact Size – ATX PSU – 10 Year Warranty | 850W | 80+ Gold | ATX | Full-Modular | $119.99 | 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 9900X) and GPU (NVIDIA GeForce RTX 5080), 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 AMD's Eco Mode in the BIOS to limit the CPU's power consumption, reducing heat and overall system power draw during less demanding tasks.
Utilize NVIDIA's GeForce Experience to optimize game settings for performance and power efficiency, balancing visual quality with lower GPU power consumption.
Consider undervolting the GPU slightly. This can reduce power consumption without significantly impacting performance, especially at higher resolutions.
Special Installation Note
Ensure the 12V-2×6 (or PCIe 5.0) cable is securely connected to the RTX 5080 and the PSU. Avoid using adapters or daisy-chaining cables, as this can lead to instability or damage due to the high power draw of the GPU.
Usage Scenarios
Ultra Gaming
Play the latest AAA games at maximum settings, 4K resolution, and high refresh rates with ray tracing enabled. Enjoy smooth, immersive gameplay.
Content Creation
Edit and render high-resolution videos, create complex 3D models, and stream high-quality content without lag or performance issues.
AI Development
Train complex machine learning models and run demanding AI simulations quickly and efficiently, thanks to the powerful CPU and GPU combination.
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 5080 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 RM850e offers reliable 850W power, ATX 3.1 & PCIe 5.1 for your 5080, and gold efficiency, perfect for your high-end Ryzen/NVIDIA build.