UserBenchmark - Free Online CPU, GPU & PC Stress Test

UserBenchmark is a free online benchmark tool that tests your CPU, GPU, RAM, and storage directly in your browser. No downloads or installations required.

Features

Path Tracing Mode — Real-time ray-traced global illumination with realistic soft shadows for extreme GPU stress testing.
Soft Shadow Rendering — PCSS shadows, ambient occlusion, and volumetric god rays for intensive GPU workloads.
Multi-Stage Stress Test — CPU saturation via parallel workers, GPU compute with Mandelbrot fractals, and VRAM pressure testing.
Live Frame Metrics — Frame time, throughput, and performance degradation tracked in real-time.
Zero Installation — Runs entirely in your browser. No downloads, no admin rights, no background processes.

How It Works

Start Test — Click to begin. Nothing runs in the background.
CPU Stress — All logical cores saturated with continuous math operations.
GPU Compute — Mandelbrot fractals with blur and bloom effects.
VRAM Pressure — Heavy texture uploads stress GPU memory bandwidth.
View Results — Frame time, stability, and degradation metrics.

Frequently Asked Questions

What is UserBenchmark and how does it work?

UserBenchmark is a free online benchmark tool that tests your CPU, GPU, RAM, and storage directly in your browser to show performance scores and compare against other users with similar hardware.

Do I need to download anything?

No — you can run UserBenchmark's tests directly in your browser without installing software.

Can stress testing damage my PC?

Not if done properly. However, sustained stress tests can reveal cooling, power, or stability issues in systems with existing problems.