Chemistry Calculator

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Authored by: David Chen, PE (Power Electronics Specialist)
This calculator provides an estimated required power supply unit (PSU) wattage based on typical component power draw values. Always consult component manufacturer specifications for precise requirements.

The **PC PSU Calculator** is an essential tool for system builders and hardware enthusiasts. It helps you determine the adequate power supply wattage required for your computer build, ensuring system stability, longevity, and efficiency. Undersizing a PSU can lead to unexpected shutdowns and component damage.

PC PSU Calculator

Estimated Minimum PSU Wattage Required:
No Result

Calculation Steps

PC PSU Calculation Formula:

$$P_{Total Draw} = P_{CPU} + P_{GPU} + (Q_{RAM} \cdot 5W) + (Q_{Storage} \cdot 5W) + 50W$$

$$P_{PSU Recommended} = P_{Total Draw} \cdot (1 + \frac{F_{Buffer}}{100})$$

Formula Sources: Corsair PSU Calculator, OuterVision PSU Calculator

Variables:

  • CPU Thermal Design Power (TDP): The maximum heat generated by the CPU, often used as a proxy for its power consumption.
  • Graphics Card (GPU) Maximum Wattage: The peak power the GPU can draw under load. This is usually the single largest power consumer.
  • Number of RAM Sticks (Quantity): Each stick of RAM consumes a small amount of power (typically 3-5W). We use 5W for estimation.
  • Number of Storage Devices (SSD/HDD): Each drive, especially mechanical HDD, requires power (typically 5-10W). We use 5W for estimation.
  • Recommended Power Buffer (%): A safety margin (typically 20-30%) added to the total draw to ensure the PSU runs efficiently (around 50-80% load) and handles power spikes.

What is a PC PSU Calculator?

A Power Supply Unit (PSU) calculator is a tool designed to estimate the total electrical power requirements of a computer system’s components. By inputting the specifics of high-draw components like the CPU and GPU, alongV}

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