GPU (graphics card)

A GPU — graphics processing unit, commonly called a graphics card — is the component that draws what you see. Where a CPU has a handful of powerful cores designed to do complicated things one after another, a GPU has thousands of simple cores designed to do the same operation on huge amounts of data at once.

That shape suits graphics exactly. Every pixel on a 4K screen needs calculating, eight million of them, sixty times a second. That is not a job for a few fast cores; it is a job for thousands of parallel ones.

Why is the graphics card the most important part of a gaming PC?

Because it is almost always the limiting factor. In most games the GPU is working flat out while the CPU has capacity to spare — so it is the GPU that decides your resolution, your settings and your frame rate.

The practical consequence for anyone building a PC: if the budget is fixed, put more of it into the graphics card than into the processor. A mid-range CPU with a strong GPU outperforms a strong CPU with a mid-range GPU in almost every game.

The exceptions are worth knowing. Strategy games with thousands of units, simulations, and competitive shooters running at very high frame rates on low settings can all become CPU-limited. If that is what you play, the balance shifts.

VRAM

The graphics card has its own memory, called VRAM, which holds textures and the data being drawn. Running out of it causes stutter and forces textures to load in visibly late — and unlike raw speed, you cannot compensate for it. A card with plenty of performance but insufficient VRAM will struggle at high texture settings.

This is the specification most often underweighted when comparing cards, because it does not appear in headline benchmark numbers.

On consoles

A console GPU is integrated into a single custom chip alongside the CPU and cannot be upgraded — which is the trade-off for everything being tuned to work together and for games being built for exactly that hardware.

See our PC games page for the PC side of the catalogue.