that right there is simply the best pci video card anyone can buy anywhere. how well does it perform? well, it'd definitely be quite a bit slower than any gf2 with ddr.
see, the mx420 uses sdram video memory... which simply doesn't stack up against ddr, which is what 95% of video cards come with nowadays. see where it says 2.7gb/sec memory bandwidth? mine was 5.3gb/sec before i overclocked it. 6.4gb/sec now. and if none of this sounds like a big deal, memory speed is directly linear with 3d performance... simple as that.
not to mention the gf4 mx chips are little more than gf2's with anti-aliasing technology which doesn't do much for you.
if you want to spend $100 on that card, go ahead. it's so-so. but before you do, i'd seriously consider saving up instead for a new motherboard, even a cheap one (maybe $50)... one with an agp slot. then you can spend $50 on a video card that's almost 3x faster than that mx420.
hope all that made sense. }:>