😀 Check out the links given mee987, faster RAM equals more bandwidth which means more data can be processed and sent, yielding it's best results in higher resolutions. The days of worrying about how much RAM you needed to attain a given resolution pretty much ended when gfx cards hit 4MB, of course 1600x1200 will use up more memory than 1024x768, especially when you consider 32bit of information per pixel, but the situation gets even more complex the deeper you delve with AA and filtering techniques coming in to play. The 64MB at 250/500 is faster in pretty much all cases IIRC than the 128MB at 250/444 ESPECIALLY when applying AA. So basicly you want plenty of RAM but it is of fundamental importance that it runs quickly too.
😉 Although 4.0ns gfx RAM should technically get up to only 500mhz, for some reason 4200 cards surpass these technical limits, be it down to design or better RAM yields. This is why it is actually possible for manus to implement 5.0ns RAM in to 128MB 4200 cards but thank goodness I haven't seen any of that yet! In essence, I would suggest to anybody looking for a 4200 card to see what the prices and their budget are like. 128MB is a distinct advantage in any new card, and is VERY likely to become VERY significant over the next 6 months. I'd pay the extra for 128MB 4.0ns over 64MB 4.0ns, but then it would come down to the prices of 3.6ns 4200 cards as to whether they'd be worth it. It's always best to keep a watchful eye on exactly how much you're spending because you may find you're spending a lot extra simply to gain a few extra % perf, or indeed that a 4400 would actually be within your budget. Always rem it depends a lot upon where you live, US seem to have it best in both prices and availibility, but it all varies quite dramaticly from country to country.