Best PSU for Intel Core i9-14900KF and NVIDIA GeForce RTX 5080
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NVIDIA GeForce RTX 5080
Configuration Analysis
System Performance Assessment
This system is built for extreme performance. The i9-14900KF and RTX 5080 pairing will crush any modern game at maximum settings and high resolutions (1440p, 4K), and will excel in demanding content creation tasks such as video editing, 3D rendering, and AI development. Expect very high framerates and minimal bottlenecks.
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 offers reliable 850W power with ATX 3.1 & PCIe 5.1 for your i9 and RTX 5080, ensuring future-proofed stability.
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: 850W for your i9 and RTX 5080, ATX 3.1 ready, and the 10-year warranty provides peace of mind.
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 i9-14900KF) 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 CPU power saving features in the BIOS (e.g., SpeedStep, C-states) to reduce power consumption when the system is idle or under light load.
Utilize NVIDIA's GeForce Experience to optimize game settings for the best balance between visual fidelity and power efficiency.
Consider undervolting the GPU to reduce its power consumption without significantly impacting performance. Tools like MSI Afterburner can facilitate this.
Special Installation Note
Ensure the PSU's 12VHPWR (12V-2×6) connector is securely plugged into the RTX 5080. Double-check for a firm connection to prevent potential power delivery issues and component damage.
Usage Scenarios
Ultra Gaming
This PC can handle any game at maximum settings, including ray tracing, at 4K or even 8K resolution with high refresh rates.
Content Creation
Effortlessly edit 8K video, render complex 3D scenes, and run demanding creative software with blazing fast speeds and responsiveness.
AI Development
Train complex AI models, run simulations, and perform data analysis quickly and efficiently thanks to the powerful CPU and GPU.
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 850W Gold is perfect! It's fully modular and delivers ample, efficient power for your i9-14900KF and RTX 5080 combo.