What is... the videocard?
The refreshment speed
The refreshment, apart from the Coca-Cola, is the number of times that draws the screen in second (like the stills of the movies); obviously, major all that is less one will tire the sight to us and we will work more comfortable and with less visual problems.
It measures itself in hertzes (Hz, 1/second), so it means 70 Hz that the screen shows every second 1/70, or 70 times per second. To work comfortably we will need this 70 Hz. To work ergonómicamente, with the minimum of visual fatigue, 75-80 Hz or more. 60 Hz is the absolute minimum; below this number the eyes suffer very much, and a few minutes are enough to begin feeling burning sensation or even a small headache.
Formerly a so called horrible skill was used interlaced, that consists of the fact that the screen shows in two spent ones, first the odd lines and then you give birth to them, therefore 70 interlaced Hz it is equivalent to little more than 35 without interlacing, what tires the sight exceedingly. Fortunately the skill is in desuetude, but in the monitors of 14 " it has been used even does a pair of years.
The motive of so much interlaced and not interlaced is that to construct monitors that support good refreshment speeds to high resolution is quite expensive, therefore the videocard was using these truquitos to save at the cost of the sight of the user. Nevertheless, all the videocards cannot offer any refreshment speed either. This depends on two parameters:
Since we have said, his size influences the possible ways of video (all that more exists, more options we will have); also, his type determines if we will obtain good speeds of refreshment of screen or not. The most common types are:
Connectors: PCI, AGP...
The graphic card, like added that it is to the PC, gets connected to this one by means of a slot or groove of expansion. Many types of grooves of expansion have been created precisely to satisfy to the enormous quantity of information that transmits every second to the graphic card.
In any case, the connector can only limit the speed of a card, does not raise it, what he explains that some cards PCI should be much more rapid than other cheaper or worse made AGP.
Adequacy to the use of the computer
Obviously, it is not the same to choose a graphic card to be employed at Word in a monitor of 15 " than to do CAD in one of 21 ". One notice that I always allude to the monitor with which they are going to work, because a very good card cannot demonstrate it in a bad monitor, not on the contrary.
The indications are generic; to know more on this topic, go to the videocards paragraph in What components to buy for...
In general, at present the topic takes root in knowing if it is needed or do not support 3D; the acceleration 2D, that is to say, that of Windows, office computerization, Internet, etc, is for a long time more than obtained; almost all the cards give spectacular and almost indistinguishable numbers in any test 2D.