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GPU Power Consumption Calculator

Professional-grade power supply calculator for PC builds and mining rigs. Features a massive database of GPUs/CPUs, real-time cost estimation, wall-draw analysis, and PSU efficiency curves.

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Category System & Hardware
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Add components and click "Calculate" to see detailed power analysis.

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About

Designing a high-performance workstation, gaming PC, or mining rig requires precise electrical planning. Underestimating power requirements can lead to system instability, random shutdowns, or even hardware failure due to transient voltage spikes. This tool is engineered to provide a comprehensive analysis of your system's electrical footprint.

Unlike basic calculators that simply sum up TDP (Thermal Design Power) values, this engine accounts for System Overhead, PSU Efficiency Curves, and Real-World Wall Draw. It calculates the actual load your electricity meter records, which is often 10% to 20% higher than the internal component consumption due to AC-to-DC conversion losses.

Use this tool to determine the exact Power Supply Unit (PSU) wattage needed to maintain a safe 20-30% headroom, calculate monthly operational costs based on local energy rates, and estimate the amperage load on your circuit breaker.

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Formulas

The calculator uses a multi-stage process to determine the final electrical load and cost. First, we calculate the Total System Power (TSP) by summing the adjusted TDP of all components:

Psys = n∑i=1 (TDPi × Qtyi × Limit%)

Next, we determine the Wall Draw. Since no PSU is 100% efficient, the power drawn from the wall is higher than the power delivered to the components. Efficiency (η) typically ranges from 0.80 to 0.94:

Pwall = Psysη

Finally, monthly operational cost is calculated by integrating usage over time:

Costmonth = Pwall1000 × thours × 30 × Ratekwh

Reference Data

Component SeriesModel NameTDP (Watts)Rec. PSU (System)Power Connector
NVIDIA RTX 40 SeriesGeForce RTX 4090450 W850 W+1x 16-pin (12VHPWR)
NVIDIA RTX 40 SeriesGeForce RTX 4080320 W750 W1x 16-pin (12VHPWR)
AMD RX 7000 SeriesRadeon RX 7900 XTX355 W800 W2x 8-pin
NVIDIA RTX 30 SeriesGeForce RTX 3090 Ti450 W850 W+1x 16-pin / 3x 8-pin
AMD RX 6000 SeriesRadeon RX 6950 XT335 W850 W2x 8-pin
WorkstationNVIDIA RTX 6000 Ada300 W750 W1x 16-pin
Intel ArcArc A770 Limited225 W600 W1x 8-pin, 1x 6-pin
Legacy High-EndGeForce GTX 1080 Ti250 W600 W1x 8-pin, 1x 6-pin
Legacy Mid-RangeRadeon RX 580185 W500 W1x 8-pin
Entry LevelGeForce RTX 3050130 W450 W1x 8-pin

Frequently Asked Questions

TDP (Thermal Design Power) is the maximum heat a component generates that the cooling system must dissipate, which roughly correlates to power consumption in Watts. "Wall Draw" is the actual electricity pulled from your outlet. Because PSUs lose energy as heat during conversion (efficiency loss), Wall Draw is always higher than the sum of your components' TDP.
Engineering best practices recommend running a PSU at 50-70% of its rated capacity for maximum efficiency and longevity. We recommend a buffer of at least 25-30% above your maximum system load to account for transient spikes (micro-second power surges common in modern GPUs) and capacitor aging.
Knowing the Amperage is critical for safety, especially with multi-GPU mining rigs or high-end workstations. A standard US residential circuit is 15 Amps (approx. 1440W continuous safe load). If your rig draws 1600W, you risk tripping the breaker or overheating the wiring. The tool calculates this for both 110V and 230V standards.
Yes. Reducing the power limit (undervolting) can significantly drop power consumption often with minimal impact on performance. For example, running an RTX 3080 at 80% power limit might save 60-70 Watts per hour. Over a year of 24/7 operation, that's ~600 kWh saved, which could equal $100+ depending on your local rates.
The database uses the manufacturer's reference specs (Founders Edition / Reference). Third-party cards (ASUS ROG, MSI Suprim, etc.) often come factory overclocked with TDPs 5-15% higher. You can adjust the "Power Limit" slider to >100% to account for these factory overclocks.