You'll have to upgrade them yourself right after you download them from the graphics card company's website, or in the case of NVidia chips, get the drivers right from NVidia. Another thing to keep in mind about drivers is that some of the big boys use proprietary OEM graphics cards that are similar to the hot new ones on the market, but may lack certain key features. Take care if you buy some funny OEM graphics card at a computer show. Another important part of the big picture in video cards that you should keep in mind is the refresh rates your card supports. This is the amount of times that the video card will send a full screen picture signal to the monitor.
Most cards can display a variety of refresh rates for any particular resolution.
You'll find that supported refresh rates are generally lower at higher resolutions. If the refresh rate is set lower, say at 60 or 70Hz, there will be noticeable flicker on the monitor which can lead to eyestrain and feelings of tiredness. The higher the refresh rate, the more stable or solid the picture will appear. To the untrained eye it's tough to notice, but it's worth knowing about. Most of the time, the monitor is the bottleneck when going to high refresh rates or resolutions.