Best PSU for AMD Ryzen 7 7800X3D and AMD Radeon RX 9070 XT
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AMD Radeon RX 9070 XT
Configuration Analysis
System Performance Assessment
This system, featuring a Ryzen 7 7800X3D and an RX 9070 XT, is capable of exceptional gaming performance at 1440p and 4K resolutions. It will handle demanding AAA titles with high refresh rates and graphical settings. Content creation tasks like video editing and 3D rendering will also be handled with ease thanks to the powerful CPU and GPU.
Recommended Power Supplies
CORSAIR RM750e (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
ARESGAME AGV Series 750W Power Supply, 80 Plus Bronze Certified, Semi Modular Power Supply, 5 Year Warranty
The ARESGAME 750W Bronze is a solid choice, offering reliable semi-modular power and a 5-year warranty for your 7800X3D/RX 7900 XT build.
Thermaltake Smart 700W 80+ White Certified PSU, Continuous Power with 120mm Ultra Quiet Fan, ATX 12V V2.3/EPS 12V Active PFC Power Supply PS-SPD-0700NPCWUS-W
The Thermaltake 700W provides ample, continuous power for your Ryzen 7 and RX 7900 XT, ensuring stable performance without breaking the bank.
Comparison Table
| Model | Wattage | Efficiency | Form Factor | Modularity | Price | Best For |
|---|---|---|---|---|---|---|
| CORSAIR RM750e (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 | 750W | 80+ Gold | ATX | Full-Modular | $114.99 | Overall Value |
| ARESGAME AGV Series 750W Power Supply, 80 Plus Bronze Certified, Semi Modular Power Supply, 5 Year Warranty | 750W | 80+ Gold | ATX | Semi-Modular | $54.9 | Energy Efficiency |
| Thermaltake Smart 700W 80+ White Certified PSU, Continuous Power with 120mm Ultra Quiet Fan, ATX 12V V2.3/EPS 12V Active PFC Power Supply PS-SPD-0700NPCWUS-W | 700W | 80+ White | ATX | Non-Modular | $54.99 | Budget Builds |
Why This Wattage?
Power Calculation
The recommended PSU wattage is calculated based on the total power draw of your CPU (AMD Ryzen 7 7800X3D) and GPU (AMD Radeon RX 9070 XT), 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 AMD's Radeon Chill to dynamically adjust frame rates, reducing GPU power consumption during less demanding scenes.
Consider undervolting the GPU slightly to reduce power draw without significantly impacting performance; monitor thermals closely.
Ensure your CPU cooler is properly installed and functioning to prevent thermal throttling, which can lead to inefficient power usage.
Special Installation Note
The RX 9070 XT likely requires multiple PCIe power connectors. Ensure you use separate cables from the PSU to each connector on the GPU, rather than daisy-chaining them, to ensure stable power delivery and avoid potential issues.
Usage Scenarios
AAA Gaming
Play the latest graphically demanding games at maximum settings with high frame rates and stunning visuals at 4K resolution.
Video Editing
Effortlessly edit and render high-resolution videos, including 4K and 8K footage, with fast processing and smooth playback.
Heavy Multitasking
Run multiple demanding applications simultaneously, such as gaming while streaming, without experiencing performance bottlenecks or slowdowns.
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 AMD Radeon RX 9070 XT 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 RM750e offers headroom for your 7800X3D/RX 9070 XT, plus ATX 3.1 ensures future GPU compatibility and stable power delivery.