the 975 is pretty overkill paired next to the GTS-240 it is a diamond in a donkeys ass. What I mean to say is you went overkill on the CPU but skimped on the video card.

I am not a fan of Alienware it is a fine computer and all and will easily 5 box but you are paying for the label.

If it was me I would scale down the CPU and put a little more into the video card maybe get an SSD.

If your heart is set on this box than yes it will do what you want.