What should specs should i consider when buying video cards?

Aug 8, 2015
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hello guys i have a problem when buying videocard and comparing them what should is the first thing to consider in buying video card is it the clock speed, memory bandwidth or what cause i am comparing hd 5670 and geforce 730gt and i cant decide because overall the nvidia has better clock speed but the 5670 has the better memory bandwidth so what should i consider in buying video cards whats specs should i set in my eyes thanks