The role of graphic cards in your computer cannot be belittled, especially if you are working with video editing, 3D design and graphics. These cards come as an expansion to be inserted in the expansion card slots of the computer. These are designed to process different image to be outputted to the screen or any monitor you prefer.
A typical GPU is component consist of a memory chip, processor but modern once has SLI, tv output and video capture. Please make sure to looked for essential thighs before buying one carefully.
You need first to find out whatever you need a GPU for, is it for handling 2D images or 3d images, you need to make a decision first. Most graphics card can handle 2D images today but if you really want the hardcore like 3D graphics games, you need a high-end graphics card as http://www.graphicscardsadvisor.com explains. Therefore, in this regard the difference between a high-end and a lower end can make a difference of your purpose, both in terms of performance and cost.
Graphics card today include a graphic processing unit, a small microchip that is responsible for providing memory and algorithms to process complex and bigger images. This chip reduces the workload of the CPU and enables it to work efficiently and faster.
Today’s graphic cards come with different processing power. They have the ability to refresh images and create deep images even at lower resolutions. It can calculate shadow and avoids pixelation.
You should also look at processor lock speed, memory size and bandwidth. The rendering capacity depends on processor lock speed and can be measured pixels per clock cycle. The memory capacity of these cards may range from 512mb to 4gb, the greater the capacity the better. In terms of memory bandwidth, the higher the better at transferring data. You can know more about this topic here graphicscardsadvisor.com/gtx-1070-vs-rx-590.
Look also for shader models in GPU, this is the one that control the images in screen. Fill rate, you need to look at it. It is important in counting the rate of texels per second. There are so many specifications to look into for making a wise decision on buying your graphics card.