The graphics part, and why video needs it
Understand why a computer contains a second, very differently built processor — and whether you need a good one.
A modern screen is a grid of roughly two million tiny lights. To show a video, every one of them has to be given a new color thirty or sixty times every second.
A processor could do it — but a processor is built to do one complicated thing after another, extremely fast. This job is the exact opposite: two million identical, trivial decisions, all needed in the same instant.
So computers carry a second kind of chip, built the other way round: hundreds or thousands of small, unremarkable workers, all doing the same simple sum at once. That is the graphics processor, usually shortened to GPU.
Key points
- Graphics work is millions of identical tiny decisions at the same moment
- A GPU is many small workers; a CPU is a few very fast ones
- Video calls with background blur are the heaviest graphics job in most homes
- A separate graphics card is for games and video editing, and is wasted money otherwise
What to remember
- For work that splits into thousands of identical pieces, many slow workers beat one fast one. Drawing a screen is exactly that kind of work.
- If a video call makes your laptop’s fan roar, that is the graphics part working hard. It is not a fault, and turning the background blur off will quieten it immediately.
- Smooth from the disk but stuttery from the internet means the connection, every time.
Try this
Next time you are on a video call, put your hand near the vent of your laptop. The warmth and the fan noise are the graphics part earning its keep. Turning background blur off is the quickest single way to make an older laptop comfortable on calls.
Practice: The graphics part, and why video needs it. Your first lesson is free, with no account or card; the rest are part of a Lantern plan. Interactive lessons require JavaScript.