In-depth

What is a GPU?

GPUs aren't just good for gaming - they have business applications too

A GPU model against a black background

If we think of a central processing unit (CPU) as the logical thinking section of a computer’s silicon brain, then the graphics processing unit (GPU) is its creative side, helping render graphical user interfaces into visually attractive icons and designs rather than reams of black and white lines. 

While many CPUs come with some form of integrated GPU to ensure that Windows can be displayed on a connected screen, there is a myriad of more intensive graphics-based tasks, such as video rendering and computer-aided design (CAD) that often require a dedicated or discreet GPU notably in the form of a graphics card. 

When it comes to the latter, Nvidia and AMD are the two main players in the graphics card arena, while Intel’s own Iris Plus and UHD integrated GPUs tend to carry out a lot of light-weight work in laptops without dedicated graphics. On the mobile side, the likes of Qualcomm and MediaTek provide lightweight GPUs for handheld devices, though these often come in system-on-a-chip (SoC) designs where the GPU is on the same chip as the CPU and other core mobile chipset components. 

It can be easy to think of a GPU as something only people keen on playing PC games are interested in, but a GPU provides a lot more than just graphical grunt.

What does a GPU do?

"GPU" became a popular term for the component that powers graphics on a machine in the 1990s, when it was coined by chip manufacturer Nvidia. The company's GeForce range of graphics cards were the first to be popularised and ensured related technologies such as hardware acceleration, programmable shading and stream processing were able to evolve.

While the task of rendering basic objects, like an operating system's desktop environment, can usually be handled by the limited graphics processing functionalities built into the CPU, some more strenuous workloads require extra horsepower, which is where a dedicated GPU comes in.

In short, a GPU is a processor that is specially-designed to handle intensive graphics rendering tasks.

Computer-generated graphics - such as those found in videogames or other animated mediums - require each separate frame to be individually 'drawn' by the computer, which requires a large amount of power.

Most high-end desktop PCs will feature a dedicated graphics card, which occupies one of the motherboard's PCIe slots. These usually have their own dedicated memory allocation built into the card, which is reserved exclusively for graphical operations. Some particularly advanced PCs will even use two GPUs hooked up together to provide even more processing power.

Closeup of computer graphics chip GPU inside a laptop

Laptops, meanwhile, often carry mobile ships, which are smaller and less powerful than their desktop counterparts. This allows them to fit an otherwise bulky GPU into a smaller chassis, at the expense of some of the raw performance offered by desktop cards.

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What are GPUs used for?

Even though GPUs tend to usually be associated with realistic graphics in top-quality video games, other industries also use them.

For example, in business applications like AutoCAD, GPUs provide the benefit of rendering 3D models. As this type of software demands constant changes in very little time, the PC on which it is rendered must be capable of withstanding the strain of the editing process. In this example, the GPU facilitates the re-rendering of the 3D models.

Moreover, another popular use of GPUs is in video editing. This is especially true when working with massive quantities of high-resolution files, like 360-degree or 4K videos. At times it can be troublesome to edit these kinds of files for most standard GPUs, which is exactly the reason why a high-end GPU is very useful thanks to its ability to transcode the video files at a reasonable speed.

Furthermore, GPUs are extremely useful when it comes to the creation of neural networks and processing the functions of machine learning. This is another task that can be overwhelming for a CPU due to the large amount of data involved in the process.

Despite this, it’s necessary to mention that not all GPUs are made equally. If you’re after a specialised, enterprise kind of processor which is made for specific applications, it is recommended that you select a GPU with additional in-depth support. These are produced by various semiconductor industry giants, like AMD and Nvidia, which are known for supplying high-level components for some of the biggest tech companies, from Facebook and Google to Microsoft and Lenovo.

Who are the biggest GPU companies?

Nvidia

Nvidia is a US technology company based in California, founded in 1993, that designs GPUs for gaming and professional markets, as well as system on a chip units (SoCs) for the mobile computing and automotive markets. Its primary GPU line is GeForce, which is a direct competitor to AMD’s Radeon.

Some of its well-known GPUs include the GeForce RTX 3080, Nvidia Titan V, and the Nvidia RTX A6000. Right now, due to a worldwide shortage of graphic cards, it can be tricky to get your hands on one of its GPUs, especially its GeForce RTX 3070 cards.

In July 2021, Nvidia switched on what it claimed to be the UK’s fastest supercomputer, the Cambridge-1, which contained a number of NVIDIA A100 Tensor Core GPUs.

AMD

Advanced Micro Devices, also known as AMD, was founded in 1969 and is another US tech company based in California. It develops computer processors and other products for business and consumer markets. It originally manufactured semiconductors before spinning off this division in 2008, which was then formed into GlobalFoundries.

AMD’s main products include motherboard chipsets, microprocessors, graphics processors, and embedded processors. Some of its products include the AMD Radeon graphics series and the Ryzen processor range.

In March, the company announced it would launch the Ryzen 5000 Pro series of mobile processors for thin and light business laptops. This consists of three chips: the Ryzen 7 Pro 5850U, Ryzen 5 Pro 5650U and Ryzen 3 5450U. The 5850 is the highest spec of the three, featuring an eight-core, 16-thread design, 20MB cache and base and boost clock frequencies of 1.9GHz and 4.4GHz, respectively. AMD claimed the chip is the only processor with eight high-performance cores designed for thin and lightweight laptops.

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