Which lenovo models have BIOS option to choose discrete graphics

10-11  Source: Network gathering  Views:0 

I am planning on buying a Lenovo with an Nvidia graphics card.
Apparently, only the expensive Lenovos have an option in the BIOS to choose 'discrete graphics' or the dedicated graphics card.
The cheaper Lenovos only have a choice between 'Switchable graphics' and 'UMA only'( which I guess is the integrated graphics).
Can someone tell me which is the least expensive Lenovo model that has an option to choose 'Discrete graphics' in the BIOS ?
The W520, by Indian standards, is an expensive model.
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