Best PSU for Intel Core Ultra 9 285K and NVIDIA GeForce RTX 5080
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NVIDIA GeForce RTX 5080
Configuration Analysis
System Performance Assessment
This system, featuring a high-end Intel Core Ultra 9 CPU and NVIDIA RTX 5080 GPU, is capable of handling virtually any task with ease. Expect exceptional performance in demanding games at maximum settings, smooth 4K (or higher) resolution gameplay, and blazing-fast rendering speeds for content creation. Multitasking and resource-intensive applications will run flawlessly.
Recommended Power Supplies
Thermaltake GF1 (2024) Fully Modular ATX 850W Power Supply – 80 Plus Gold – Ultra Quiet – Zero RPM, PS-TPD-0850FNFAGU-P
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
The RM850e's 850W, ATX 3.1 compliance, and 12V-2×6 cable are perfect for your Ultra 9 and RTX 5080, ensuring stable power delivery.
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 ensures reliable power for your Ultra 9 & RTX 5080, with headroom to spare.
Comparison Table
| Model | Wattage | Efficiency | Form Factor | Modularity | Price | Best For |
|---|---|---|---|---|---|---|
| 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 | $94.99 | Overall Value |
| 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 | 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 (Intel Core Ultra 9 285K) 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 NVIDIA's DLSS or Frame Generation in supported games to improve frame rates without significantly increasing power consumption.
Utilize the Intel Core Ultra 9's power saving features in the BIOS to reduce CPU power draw during less demanding tasks.
Monitor system temperatures and adjust fan curves to optimize cooling performance while minimizing fan noise and power usage.
Special Installation Note
Ensure the 12V-2×6 cable (if provided with the PSU) is securely connected to the RTX 5080 to provide sufficient power, as it might draw significant power under load. Double-check the cable is fully seated.
Usage Scenarios
Gaming Domination
Play the latest AAA games at maximum settings (4K/120Hz+) with ray tracing enabled, experiencing incredibly smooth and immersive gameplay.
Content Creation
Effortlessly edit 8K videos, render complex 3D models, and stream high-quality content without lag or performance bottlenecks.
AI Development
Train demanding AI models, run complex simulations, and accelerate machine learning tasks 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 Thermaltake GF1's 850W and 80+ Gold efficiency are perfect for the 285K and RTX 5080, with headroom for future upgrades!