Best PSU for Intel Core i9-14900KF and NVIDIA GeForce RTX 5090
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NVIDIA GeForce RTX 5090
Configuration Analysis
System Performance Assessment
This enthusiast-level system, powered by the i9-14900KF and RTX 5090, is built for ultimate performance. Expect to effortlessly handle any modern game at maximum settings, including ray tracing, and excel in demanding content creation tasks like video editing, 3D rendering, and AI model training. It's a top-tier machine designed for uncompromising performance.
Recommended Power Supplies
Corsair RM1200x Shift Fully Modular ATX Power Supply – Modular Side Interface – ATX 3.0 & PCIe 5.0 Compliant – Zero RPM Fan Mode – 105°C-Rated Capacitors – 80 Plus Gold Efficiency – Black
NZXT C1200 Gold ATX 3.1 – Fully Modular Low-Noise PC Gaming Power Supply – 1200 Watts – 80 Plus Gold – 12V-2×6 Connector – Zero Fan Mode – 100% Japanese Capacitors – Black
The NZXT C1200 Gold offers plenty of headroom for your i9 and RTX 5090, with future-proof ATX 3.1 and a quiet, reliable design.
ASUS TUF Gaming 1200W Gold (1200 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 1200W Gold offers ample headroom for your power-hungry i9 and RTX 5090, plus ATX 3.0 ensures next-gen compatibility and reliability.
Comparison Table
| Model | Wattage | Efficiency | Form Factor | Modularity | Price | Best For |
|---|---|---|---|---|---|---|
| Corsair RM1200x Shift Fully Modular ATX Power Supply – Modular Side Interface – ATX 3.0 & PCIe 5.0 Compliant – Zero RPM Fan Mode – 105°C-Rated Capacitors – 80 Plus Gold Efficiency – Black | 1200W | 80+ Gold | ATX | Full-Modular | $199.99 | Overall Value |
| NZXT C1200 Gold ATX 3.1 – Fully Modular Low-Noise PC Gaming Power Supply – 1200 Watts – 80 Plus Gold – 12V-2×6 Connector – Zero Fan Mode – 100% Japanese Capacitors – Black | 1200W | 80+ Gold | ATX | Full-Modular | $193.99 | Energy Efficiency |
| ASUS TUF Gaming 1200W Gold (1200 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) | 1200W | 80+ Gold | ATX | Full-Modular | $191.99 | 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 5090), 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 the PSU's zero RPM fan mode for silent operation during low-load tasks like web browsing or office work.
Monitor power consumption via software like MSI Afterburner or the PSU's monitoring utility to identify and optimize power usage.
Enable NVIDIA's power management features in the control panel to dynamically adjust GPU power based on workload.
Special Installation Note
With the RTX 5090, ensure you are using the correct 12VHPWR (12V-2×6) cable directly from the PSU to the GPU. Avoid using adapters if possible, as they can be a point of failure, and ensure the cable is fully and securely plugged in.
Usage Scenarios
Gaming Domination
Plays any game at maximum settings, 4K resolution, and ultra-high refresh rates, providing the ultimate immersive gaming experience.
Content Creation
Effortlessly handles 8K video editing, complex 3D rendering, and real-time visual effects creation with unparalleled speed and stability.
AI Research
Accelerates complex machine learning models, large language model training, and data analysis tasks for cutting-edge AI research and development.
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 5090 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.
That Corsair RM1200x Shift will easily handle your i9 and RTX 5090, providing plenty of headroom and future-proof PCIe 5.0 support with its ATX 3.0 compliance.