It will depend on what video card you have. Older video cards may not get any updates at all, regardless of the version of the driver. Then again, sometimes older cards will simply get broken by newer drivers as well.
They really only work on newer product updates. Older cards get left behind. Oh, just because a computr is new does not mean the video card/chip is new. ATI 9000 series video chips being shipped today are about 13 years old now. NVidia 6100 series parts are around 5 years old now.