An integrated video is a decent way to save your money and to get video image of average quality. This is quite enough for office tasks or non-resource-intensive games. It is necessary to buy a separate video card for complex tasks, connected with the processing of video images, and resource-intensive games.
Integrated video cards use operating memory as video memory and central processor as video processor, consuming a significant part of system resources. A size of allocated memory may be static or dynamic. In the former case, a fixed value of allocated memory is set from 0,5 to 128 MB through BIOS. 4-8 MB is sufficient for many tasks, but you may need a larger amount of memory for games. Remember, that allocated memory becomes unavailable for the rest system almost disappears. So, for example, if you allocate 16 MB out of 32 MB of operating memory to video card, you work at the computer will be very difficult. From the other side, if you allocate only 0,5 MB of memory, a viewing of video will be like a slide-show.
If you allocate the memory dynamically, an operating system allocated a necessary amount of memory depending on the tasks to be performed. For example, only 4 MB of memory will be allocated when working in Word, 32 MB – when playing in Quake and 4 MB – if you return to Word.
In general, integrated video cards are only suitable for low-cost office computers in spite of their decent opportunities. For home usage, buy better video card. If no such possibility exists, provide an additional operating memory. Do not combine the use of built-in and peripheral video cards, as the first one consumes system resources, regardless of the type of video system you use.