PC Power Supply Calculator

A · Processor (CPU)

CPU Power Draw (TDP) Rated TDP from manufacturer specs. Actual draw may exceed TDP during turbo boost.

Range: 5W – 500W

CPU Overclocked?

No (+0%)

Overclocking increases CPU power draw by ~25%

B · Graphics Card (GPU)

GPU Power Draw (TGP) Total Graphics Power — the maximum sustained power your GPU draws. Check manufacturer specs.

Range: 0W – 700W. Set to 0 for integrated graphics.

Number of GPUs

ATX 3.0 PSU Recommended

Your GPU draws 300W+. Modern high-power GPUs can spike to 150–200% of rated TGP for microseconds. An ATX 3.0 PSU with a native 12VHPWR connector handles these transient spikes safely and prevents system crashes.

C · Memory (RAM)

RAM Type

Number of Sticks

D · Storage

NVMe SSDs (~6W each)

SATA SSDs (~3.5W each)

HDDs 7200 RPM (~9W each)

Optical Drive (20W)

E · Cooling & Fans

CPU Cooler Type

Case Fans (~2.5W each)

F · Peripherals & Other

Sound Card

Network / WiFi Card

No (8W)

Capture Card

USB Peripherals (~2.5W each)

Usage & Energy Settings

Hours of Use Per Day Average hours your PC is actively running per day (not sleep/hibernate).

5 hrs

PSU Efficiency Rating

Electricity Rate ($/kWh) US average ~$0.15/kWh. California ~$0.29/kWh. Check your utility bill.

PSU Recommendation

650W PSU

80 Plus Gold or higher ATX 3.0 Recommended

Estimated system draw: 0W • With 30% headroom: 0W

Component Power Breakdown

Peak Wall Draw

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Idle Wall Draw

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Monthly Cost

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Annual Energy

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Efficiency Comparison

Rating	Efficiency	Wall Draw	Annual kWh	Annual Cost

Solar Bridge

—

kWh/year consumed

—

of US home average

—

400W solar panels needed

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annual electricity cost

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PSU Buying Guide

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