New graphics card for an Lenovo ThinkCentre M57?

I need to buy a new graphics card for my Lenovo computer. My BIOS is Lenovo ThinkCentre BIOS Ver 2RKT54. The computer has a 280 W poer supply. My motherboard is a Lenovo ThinkCentre M57 (pretty old). I need a new graphics card that my motherboard would be compatible with. I really want to be able to run Mirror's Edge more specifically.

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