it does make a lot of difference....
the chipsets are all different in these cards....higher end chipsets allow higher core and memory clock speeds (as in frequencies) which is wat matters...higher freqs give u better performance....
infact u might sumtimes find tht cards with lesser RAM( say 64 MB to 128 MB) perform better than those with higher amounts(say 128 MB or 256 MB) even though they miht belong to the same chipset.....
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