Best PSU for Intel Core i9-14900K and NVIDIA GeForce RTX 5090
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NVIDIA GeForce RTX 5090
Configuration Analysis
System Performance Assessment
This system represents the pinnacle of gaming and productivity performance. The i9-14900K and RTX 5090 will effortlessly handle any game at maximum settings, including ray tracing, at high resolutions (1440p, 4K, and even 8K). It's also exceptionally well-suited for demanding content creation tasks like video editing, 3D rendering, and AI development.
Recommended Power Supplies
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
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
The RM1200x Shift's 1200W and ATX 3.0/PCIe 5.0 support are perfect for reliably powering your high-end i9/RTX 5090 beast.
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 has the headroom and ATX 3.0 support your 14900K & RTX 5090 need, plus a rock-solid 10-year warranty.
Comparison Table
| Model | Wattage | Efficiency | Form Factor | Modularity | Price | Best For |
|---|---|---|---|---|---|---|
| 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 | $192.99 | Overall Value |
| 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 | 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 | $219.99 | Energy Efficiency |
Why This Wattage?
Power Calculation
The recommended PSU wattage is calculated based on the total power draw of your CPU (Intel Core i9-14900K) 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
Enable CPU power-saving features in BIOS (e.g., SpeedStep, C-States) to reduce power consumption during idle or low-load tasks.
Utilize NVIDIA's power management features like 'Optimal Power' or 'Adaptive' in the NVIDIA Control Panel to dynamically adjust GPU power based on workload.
Consider undervolting the CPU and GPU slightly. This can significantly lower power draw without sacrificing much performance.
Special Installation Note
Ensure the 12VHPWR (12V-2×6) connector from the PSU is fully and securely seated into the RTX 5090. Double-check for any looseness to prevent potential issues or damage.
Usage Scenarios
Ultra Gaming
Effortlessly play any game at maximum settings, 4K resolution, and high refresh rates, achieving incredibly smooth and visually stunning gameplay.
Professional Content Creation
Quickly render complex 3D models, edit 8K video footage, and perform demanding simulations with blazing-fast speeds and unparalleled efficiency.
AI Development
Train large AI models, run complex simulations, and develop advanced machine learning algorithms with exceptional speed and performance capabilities.
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.
The NZXT C1200 Gold provides ample headroom for your power-hungry i9 and RTX 5090, ensuring stable performance with its high-quality components and 12V-2×6 connector.