Cool site for learning about GPUs(general info) may help some.

It's called how stuff works... find it here. I enjoyed it...and I have linked to just the video card part.

Please forgive if this is "old hat" to you guys!

that site gives some incorrect information, the human eye can only tell the difference between about 10 million different shades of color but has a feel for when more are used, that's why i want a fire gl x1, 24-bits per color channel 72-bit color, that is 4,722,366,482,869,645,213,696 colors or over four sextillion colors

www.howstuffworks.com is in my fav list...i go there nearly every day