Note also that flicker is more apparent on larger monitors, requiring a faster refresh rate. AGP is the current standard for video cards, and the wise upgrader will not purchase a motherboard without it. The 1X standard allows data transfers once per clock cycle, 2X twice per cycle, and 4X four times. Clearly, it is best to purchase a video card with the highest multiple that the motherboard can support. They require much less energy than CRT's.
Refresh rates can be much slower, as they hold images much longer.
There are, however, some disadvantages, though that is starting to change. They are considerably more expensive than CRT's, though the prices have been coming down. The screen size tends to be smaller. They suffer from degraded image quality as a result of the translation from digital to analog, which is required by CRT's. To allow the use of standard video cards, this has been necessary.