The GeForce2 GTS.
The GeForce 4 MX series works kind of like this, they enhanced the GeForce2 GTS with some new gimicks and called it the GeForce4 MX440. Then they cut that down to 1/2 performance like the old GeForce2 MX200, plus enhancements, to make the MX420.
There's also the MX440SE, which is similar to an updated GeForce 2 MX400.
So the GTS should be the fastest of those two.
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