wingznut pez hit the nail on the head
stability is also picking your hardware and software wisely
three years ago i bought an ati video card to play games with,the drivers were terrible and i would end up taking the games i bought,back for exchange,in hopes of getting something to play without glitches.wizard works games were a nightmare.
since that time ati's drivers have come a long way.i have only bought ati since then as i didn't like the gforce card i had gotten in a prebuilt computer(gforce 2mx400 with 64mb ram that lists as a 200 2mx).that thing crashed on my p-3 500 so many times i hated nvidia(wrongly lol)for putting out such a pos.
then came the p-4 1.5 and i gave an ati card to my dad but the only card i had left was the nvidia

guess what i learned :Q it runs every game out there without a hitch let's see jedi knight2,sof2,moh.all fine but that doesn't help spiderman(either one both are buggy) and still wizard works software.
now i know what they mean when they say nvidias drivers are top notch