Regarding Inspiron 17R se hardware

Hi, about a year ago i bought the inspiron 17R se 7720  (the i5 version) , needless to say I am very happy about it, and it's an excellent laptop. i heard from a retailer of yours that in some models of your laptops the gpu aren't embedded to the motherboard, and thus, replaceable. so i wanted to ask if this is the  case in my model?