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Video caer boost the performance of pc's when it comes to calculating various video functions while providing output signal to the monitor. The speed and capability of a video card is based  mainly on it's internal processor, memory and circuit architecture. The logic circuit that controls the video card is referred to as the video chipset.

http://www.pcguide.com/ref/video/


Video cards is one of the most important parts of a computer as it displays all your work, all your games, and all your images. It makes your computing experience enjoyable. A good video card matched with a good quality monitor would make graphics appear to be a heavenly experience.

http://www.firstpin.com/videocards.shtml


Nvidia was founded in 1993 by a group of ex-SGI engineers. The first Nvidia graphics chip was called the NV1, which was used in the popular Sega Saturn video console. This NV1 chip combined both audio and video into one package and had support for Quadratic curved surfaces. Diamond MultiMedia, whose graphics division recently was shut down and sold to Via Technologies, made the first board for the PC based on a Nvidia chip, the Edge3d. Unfortunately for Nvidia, Quadratic Curved Surfaces never caught on, since games had to be programmed specifically to take advantage of the feature.

http://www.techextreme.com/perl/story/10613.html


3 summary

http://www.voodoofiles.com/review.asp?name=1008

Within the past 3 years, we've seen the top 3 videocard companies, 3dfx, ATI & Nvidia go head to head. Due to recent developments in technology, only ATI & Nvidia remain and are still racing towards producing the fastest videocard in the industry. With ATI recently unleashing it's new lineup of Radeon videocards, along with radical improvements in their device drivers, they now lead nvidia's videocards by a small margin.

http://www.pcmech.com/show/video/355
Most consumers these days won't really care on how powerful or how fast top-end video cards are, as long as a video card can fulfill their daily tasks, they'll be okay. Consumers would always prefer a videocard that would perform best within their budget.

http://www.anandtech.com/video/showdoc.html?i=1645
While ATI & Nvidia are battling out for the most powerful videocard on the planet, Matrox has released a different kind of videocard which focuses more on offering multi-monitor display technology. With the Matrox Parhelia, 3 monitors could be run side-by-side to display the output of a computer as opposed to only 1 monitor display on most videocards.


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Video cards today are much more like coprocessors; they have their own intelligence and do a lot of processing that would otherwise have to be done by the system processor. http://www.pcguide.com/ref/video

Some of these video cards are quite astounding and have life-like rendering properties that have to be experienced in person to be believed. http://www.firstpin.com/videocards.shtml

Most video card buyers are looking for a low-to-mid range card that can “do it all” for them, meaning that although it is not the fastest gun in the west, it is capable of running any current game provided that is accompanied by a decent processor and enough memory. http://pcmech.com/show/video/355