GPU
A massively parallel processor built to render graphics and accelerate parallel workloads.
What is it?
The GPU (Graphics Processing Unit) is a specialized processor with thousands of small cores optimized for doing the same kind of calculation across huge amounts of data simultaneously — like shading millions of pixels.
What does it do?
It renders 3D scenes, applies visual effects, decodes/encodes video, and accelerates other highly parallel workloads like 3D rendering and some AI tasks.
Parallel cores
Instead of a few very fast cores like a CPU, a GPU has thousands of simpler cores that each handle a small piece of a much larger calculation at the same time.
VRAM
Dedicated high-speed memory that stores textures, frame buffers, and geometry the GPU needs immediate access to. Running out of VRAM causes stuttering or forces lower texture quality.
Memory bandwidth
How quickly the GPU can move data in and out of VRAM — set by the width of the memory bus and the memory's speed. Higher bandwidth matters more at higher resolutions.
VRAM
Useful for high-resolution textures, demanding games, and certain professional or creative workloads.
Memory Bus
A wider bus generally moves more data per cycle, mattering most at higher resolutions.
TDP
Determines cooling and power supply headroom requirements.
Outputs
Determines how many and what type of monitors you can connect.
The GPU is usually the single biggest factor in gaming frame rates and the primary accelerator for 3D rendering, video editing effects, and many creative tools.
Resolution scales GPU demand dramatically — going from 1080p to 4K roughly quadruples the pixel count the GPU has to render. Refresh rate matters too: a 240Hz monitor needs far more frames per second than a 60Hz one to look smooth.
- Power Supply — Power draw must fit comfortably within the PSU's rated wattage.
- Case — Physical length must fit within the case's clearance.
- CPU — A weak CPU can prevent a strong GPU from reaching its full frame rate.
- Monitor — Resolution and refresh rate should be matched to what the GPU can actually drive.
Common mistakes
- Undersizing the power supply for the GPU's actual power draw.
- Buying a 4K monitor without a GPU capable of driving it at playable frame rates.
- Not checking case clearance before buying a large, high-end card.
How to choose
- Pick VRAM and performance tier based on your target resolution and refresh rate, not just budget.
- Check the recommended PSU wattage against your actual power supply.
- Measure your case's maximum GPU length before buying a large card.
See GPU products and pricing, or get a build recommended.