I'm doing some research, and I found these lovely spec tables that help
you compare a lot of those different flavors of GPUs...
very useful for swimming in the sea of graphic cards!
since this is for reference and those stumbling thru searches, here's
some search phrases to maybe help matches...
difference between nvidia and ATI graphics cards,
compare nvidia and ATI
ati vs. nvidia
ultra pro GT GS GeForce Radeon