These parts are compatible with the Alienware Sentia M3450 (M3450i) as well as several other related laptop models. If you are not sure if a part is compatible, please contact us. If you would like our professionals to install the part for you for an additional $129, please fill out our online order form on service.ztronics.com and include a comment mentioning the part you'd like to purchase. (You also have the option of printing off a paper order form and mailing it to us along with your laptop.)