What PSU is recommended for an RTX 4070 Super and Ryzen 7 7800X3D?

A quality 750W 80+ Gold power supply provides optimal power delivery and headroom for this configuration.

Updated: August 2026 • Verified v1.2

PC Power Supply (PSU) Wattage Calculator

Hardware & SystemsHardware

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Recommended_PSU = ceil((CPU_TDP + GPU_TDP + System_Watts) * (1 + Headroom%) / 50) * 50

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Understanding Your Results

Calculates total raw peak component draw and applies a recommended 20-30% transient safety headroom, recommending 80+ Gold / Platinum power supply ratings.

Practical Guidance & Next Steps

Modern high-end graphics cards (RTX 4080/4090) experience brief microsecond transient power spikes; choosing a PSU with 25%+ headroom prevents unexpected shutdowns.

What is this?

A hardware power planning tool that computes total electrical power draw and recommends appropriate power supply units (PSU) with safety headroom.

How does it work?

1. Select your CPU and GPU models. 2. Choose your RAM configuration, M.2 SSD count, and cooler type. 3. View estimated raw peak wattage and recommended PSU size (750W, 850W, 1000W) with 80 PLUS efficiency guidance.

Why use it?

Ensures system stability, prevents gaming shutdowns, and avoids overpaying for unnecessary oversized power supplies.

Technical Scope & Calculation Limitations

Estimates peak load gaming scenarios. Extreme sub-zero liquid nitrogen overclocking requires specialized high-wattage custom PSUs.

Frequently Asked Questions

Headroom accounts for power supply efficiency curves (PSUs run coolest and most efficiently at 50-70% load) and absorbs transient power spikes from modern GPUs.

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