Best PSU for Intel Core i9-14900KS 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 performance. The i9-14900KS and RTX 5090 will effortlessly handle any game at maximum settings, even at 4K resolution and beyond. Expect extremely high frame rates and the ability to leverage ray tracing and other demanding graphical features without compromise. Content creation tasks will also be exceptionally fast.
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, ATX 3.0 compliance, and high efficiency are perfect for reliably powering your power-hungry i9 and RTX 5090 build.
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 ample headroom and next-gen ATX 3.0 for your i9-14900KS and RTX 5090, plus a 10-year warranty for peace of mind.
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 i9-14900KS) 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 Intel Speed Shift Technology in the BIOS to allow the CPU to dynamically adjust its frequency for power savings.
Utilize NVIDIA's GeForce Experience or similar software to optimize game settings for the best balance of performance and power consumption.
Consider undervolting the CPU and GPU slightly to reduce power consumption without significantly impacting performance; monitor stability carefully.
Special Installation Note
Ensure the 12VHPWR (12V-2×6) connector from your chosen PSU is securely and fully connected to the RTX 5090. A loose connection can lead to system instability or even damage the components.
Usage Scenarios
Extreme Gaming
Play the latest AAA titles at maximum settings, 4K resolution, and high refresh rates with ray tracing enabled, all without performance drops.
Pro Video Editing
Effortlessly edit and render complex 8K video projects with multiple layers, effects, and color grading in professional software like Adobe Premiere Pro.
AI Development
Train large AI models and run complex simulations quickly and efficiently, leveraging the powerful CPU and GPU for accelerated performance.
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 delivers ample, reliable power (including 12V-2×6) for your high-end i9/RTX 5090, with headroom for overclocking and future upgrades.