becuase, put quite simply, this card sucks. Nothing personal, but Nvidia, in their haste to make this card dirext 9 compatable, forgot some stuff. One of them was obviously speed. They also forgot about bandwidth, as some fx 5200 only ship with a 64 bit interface. In non-direct 9 benches, we see, in some cases, a geforce 4 mx 440 beating this card. If you want a half decent low range video card, I would suggest the Radeon 9100. It's only dx 8, but it is probably the fastest low end vid card. (or you could get a 8500, they are both the same)
just my $0.02