The key consideration here is the performance of the rival AMD card, the HD 5570. That's another half-height card at the same price point as the GT 430.
The only places where the Nvidia card has the edge is in the tessellation-heavy Heaven benchmark and in Far Cry 2. The rest of the time, the rather geriatric AMD card is still faster.
It's only by the very smallest of margins, but that's from a card that was released in February of this year, which is a veritable lifetime ago in GPU terms.
The Heaven benchmark was done at the usual eye-popping 2560 x 1600 resolution, while the rest were carried out at a more mainstream 1680 x 1050.