if you are asking this question, i'm afraid to say that your laptop CANNOT take a dedicated graphics chip.
there are two kinds of graphics chip for laptops: integrated, which means it's built into the motherboard and uses system ram, or dedicated, which means it is a discrete chip that uses its own memory. the dedicated chips are dramatically better. the better ones are capable of running crysis.
unfortunately, most laptops don't come with dedicated chips, and they also cannot be upgraded. for those that do have a dedicated chip, those usually cannot be upgraded as well, since the chips are soldered in. there are only a few laptops that features an upgradable graphics slot, however, those cost you $3000+ US. i'm betting you don't have one of these, you won't be asking this question otherwise.
so yeah, you don't have many options.
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