Voodoo 2 followed by 9700Pro, and then everything well behind. Not only did the Voodoo 2 outperform everything with one card then just rubbed salt in the wounds with SLI, but it also revolutionized the $600 price tag for gaming cards putting it WAY beyond the cost of any gaming card setup before it. Though there was a time, when the highend drop to about $250, those days are long gone, and we are back to $600. The more things change, the more they stay the same. No card has really come close to coming out of no where and just laying the competition to waste in practically everthing like the 9700Pro did. The 6800U was impressive, but ATi had a comparable product just a couple weeks later, unlike the months it took NVidia to release the hack job GeforceFX (dual slot, cheating drives, etc) to compete with the 9700 Pro.
Through history, NVidia had very few innovations many people accredit to them. ATi was first to 32bit, not Nvidia. 3dfx was first to true hardware FSAA, not NVidia. 3dfx announced the V5 would have the feature, then before the card made it to market, NVidia released a driver hack for their card that enabled AA. PowerVR was the the first with a T&L engine, not Nvidia.