Ordered an Alienware m15

Might be worth sticking some of these on, depending on how much clearance you have:

 

This is what I've been doing for the PCH mod for my laptops... works great.

 

My AW 13 R3 had a bare PCH and got to 100C. I added a little heatsink like @iunlock but temps were still toasty.

Keep in mind PCH is able to operate higher than CPU. 100C isn't actually it's high point, I believe it's 110-125C.

However I do recommend keeping it cool to around 80C or less if possible.