1. What is the PSU Wattage Calculator?

The PSU Wattage Calculator helps determine the appropriate power supply unit (PSU) wattage for custom PC builds by summing component power requirements and adding a safety margin for stability and future upgrades.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• \( CPU \) — Processor power consumption (TDP)
• \( GPU \) — Graphics card power consumption
• \( RAM \) — Memory modules power
• \( Storage \) — Drives power consumption
• \( Other \) — Additional components (fans, RGB, etc.)
• \( Safety Margin \) — 1.2 (20%) or 1.3 (30%) multiplier

Explanation: The safety margin accounts for power spikes, efficiency losses, and future upgrades.

3. Importance of Proper PSU Sizing

Details: An adequately sized PSU ensures system stability, prevents crashes, improves efficiency, and allows for future upgrades. Undersized PSUs can cause instability or damage components.

4. Using the Calculator

Tips: Check manufacturer specifications for each component's power requirements. For GPUs and CPUs, use TDP values as baseline. Select higher safety margin for overclocking or future upgrades.

5. Frequently Asked Questions (FAQ)

Q1: Why add a safety margin?
A: Components can have power spikes above rated TDP, and PSUs are most efficient at 50-80% load. The margin also accommodates future upgrades.

Q2: What if my exact wattage isn't available?
A: Always round up to the nearest standard PSU wattage (e.g., if calculation is 520W, get a 550W or 600W PSU).

Q3: Does PSU efficiency rating affect wattage?
A: Efficiency (80 Plus ratings) affects power draw from the wall but not the power delivered to components. Your calculation is for delivered power.

Q4: Should I consider overclocking?
A: Yes, if overclocking, use the higher safety margin (30%) and add 20-30% to CPU/GPU wattage estimates.

Q5: What about multiple GPUs?
A: Add each GPU's power requirement. For SLI/CrossFire, check if the configuration requires additional power beyond the sum.