PSU Calculator
Estimate total system wattage and find the optimal Power Supply Unit (PSU) rating for stability.
465 W
Baseline (120W) + CPU (125W) + GPU (220W)
600 W
Includes +25% transient spike headroom
581W – 767W
Optimal 50%–70% load curve for 80 Plus Gold/Platinum
Hardware Component Configuration
ℹ️ Educational Estimation & Transient Spikes
Modern graphics cards (such as NVIDIA GeForce RTX 40/30 Series and AMD Radeon RX 7000 Series) frequently exhibit microsecond power transient spikes that can reach 1.5x to 2x their rated TDP. Applying at least a 20% to 25% safety margin prevents transient over-current protection (OCP) shutdowns and keeps power supply fans operating silently within their highest 80 Plus conversion efficiency curve.
How It Works
- Aggregates thermal design power (TDP) for CPU and GPU.
- Adds baseline wattage for motherboard logic, RAM, NVMe drives, and fans.
- Applies a safety margin (15% to 40%) for optimal efficiency.
Practical Example
Frequently Asked Questions
Why add a safety margin?
Modern GPUs exhibit brief power transients exceeding rated TDP. Running a PSU around 50%-70% load delivers highest efficiency.
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