with hi-res textures/skins etc all loaded in a 32 player race i've hit 100 MB usage - but still, a 64 MB card wouldn't like hi-res textures, and even my old ATi 9000 Pro was 128 MB!
I'm no nerd, i prefer the term "Geek" :P
You don't NEED a top end PC to max LFS (i think even my old AMD 2800/9600XT could do that easy), but to max AA/Textures etc needs a surprising amount of CPU power, at least to pump out a continual 60 fps would NEED an 8800GTS and a Core 2 Duo, although 16xAA and 8xAA look the same to me, and i use 4xAA which i can only separate from 8xAA in pictures. I do like the fact it scales well, and that on a PC which can barely sustain 8 fps on Supreme Commander set to "Low" it can chuck out graphics like this at 60 fps with ease.