OK, now I understood that it is the core speed that matters in a graphics card and not really the memory. Could you please clear the following doubts of mine. - What is core speed and memory speed, what each does. - Is it neccessary to have an AGP slot to insert a graphics card into my motherboard? - Do we get better performance if we couple 2 128 MB cards with around 500 Mhz core speed, than a 256 MB card? Please help, Thank You !!!