I don't know which is better since I'm not very knowledgeable on Nvidia products.
Nvidia Galaxy GEFORCE GT 640 1 GB Frame Buffer
or
http://www.amazon.com/ASUS-HD7750-1GD5-V2-Radeon-GDDR5-Graphics/dp/B007RFYEQW/ref=sr_1_1?ie=UTF8&qid=1400363558&sr=8-1&keywords=asus+7750
Nvidia Galaxy GEFORCE GT 640 1 GB Frame Buffer
or
http://www.amazon.com/ASUS-HD7750-1GD5-V2-Radeon-GDDR5-Graphics/dp/B007RFYEQW/ref=sr_1_1?ie=UTF8&qid=1400363558&sr=8-1&keywords=asus+7750
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