It isn't possible to "kill" properly designed hardware with software. Only bad hardware dies from being used; that wimpy HD 7450, for instance, is far enough below the minimum the game needs, it strains and struggles, and over time, wears out faster because you chose cheapness ahead of quality.
The minimum four years ago was ATI's Radeon X850, which had been the top of the line six years ago. Bottom basement cards haven't moved upward particularly far over those six years, unless we look at the Integrated video from AMD and Intel, which have progressed a good ways.
http://www.gpureview.com/show_cards.php?card1=625&card2=55
These days, the lowest new model Radeon you can buy at retail in a store is the HD 7750.
The HD 6570 is still available, and will work fine:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814102994
All lower solutions than that are built into the APU / CPUs (although some retailers want really cheap old video cards, and keep using stuff like HD 5450s, but it's had a firmware plug-in performed on it for a different name.
The HD 5450 was AMD's last low-end video card actually on its own separate circuit board.
http://www.videocardbenchmark.net/gpu.php?gpu=Radeon+HD+7450
http://www.notebookcheck.net/AMD-Radeon-HD-6450M.43971.0.html