COD Advanced Warfare is a pretty demanding game, atleast for a low range laptop gpu (no offence) and that gpu also uses DDR3 ram which may be a limiter also as most gpus use GDDR5
This one seems good for that type of usage. http://www.newegg.com/Product/Product.aspx?Item=N82E16834231457
There's also this one for a lower price. http://www.newegg.com/Product/Product.aspx?Item=N82E16834231073