Video graphics cards are computer expansions that are designed to map and display both static and moving images to a monitor or other display medium. In other words, they are responsible for the colors and images that you see on your computer monitor. Today's video cards have wide-ranging capabilities that facilitate the rendering and playback of a wide range of graphics formats.
Must-Have Video Card Features
While the memory capability of your video card is important, it's not the only consideration. Many first-time buyers focus only on a video card's memory as a point of comparison, but your primary consideration should be the card's graphics processing unit (GPU), especially if you plan to use graphics-intensive applications like video games. Most manufacturers tie better GPUs to higher model numbers.
You'll also need a video card driver to go with your expansion. Drivers are computer programs that facilitate communication between expansions like video cards and sound cards and the CPU. You must have a driver installed so your system can interpret the data provided by the card.
Optional Features and Capabilities of Video Cards
While the AGP video card was once on the cutting edge, it has largely been replaced by PCI video card technology, specifically the PCI-E interface. If you want wide-ranging compatibility, it's a good idea to get a video card with PCI-E capability.
Depending on your video and graphics rendering needs, you may also choose to seek out a product with enhanced 3D, television output and FireWire capabilities.
Decoding options include, on a basic level, MPEG-2 and MPEG-4 formats, with more available.
Video capture cards are a sub-type of video card designed to be housed directly in the expansion slots on the back of your computer case. They use advanced software to capture analog video, S-video and RF modulated video, and are a must if you're using your computer for video editing applications.
Top Manufacturers of Video Cards
Many consumers mistakenly buy a top-of-the-line card rather than the best video card for their needs. If you lack the computer expertise to know which capabilities you need from your video card and which you don't, pick the brain of a friend in the know or get online and do your own research.
ATI and Nvidia are the top manufacturers of video cards servicing the North American market. Both companies produce a wide range of cards with varying capabilities, ranging from basic to extremely advanced.