Hey whats up Crimson, I did not use the RAM configurator.  I went on the support page for my Alienware 17 R4 and it says the highest RAM speed it takes is 2666 DDR4.  I just searched on Newegg and came across the G. Skill memory that was 32GB x 2 with 2666 DDR4. Here are some pictures below to confirm. Regarding your laptop, the support page shows this information;   [URL] , it looks like it should work for you laptop as well.  It shows that your model uses 2666 DDR4.   [IMAGE][IMAGE][IMAGE]
I know this was an old thread but I recently came across it and decided to install two 32GB DDR 2666MHz RAM from G. Skills Ripjaw. I have all recent bios and Windows 10 updates and it does indeed work. It shows its running at the 2666MHz speed and has 64GB ram. I have the Alienware 17 R4 laptop with the 1080 GTX and I recently gave it a few updates like a 1TB m.2 drive Gen 3 from Crucial and also add the 64GB DDR4 (2666) G. Skills Ripjaw memory. After 6 years my laptop is running like new!    
17 R4, two 32GB 2666MHz G. Skills Ripjaw