The issue is they cant sell you any 3400MHZ ram modules because apparently it is too new and not in stock. I tried  6TCK6 = 32GB HyperX Fury XMP DDR4, 3400MHz, PC4-27200, Unbuffered, 288 Pin, Dual Rank, 1.25V, Non-ECC, Aurora R11/R10, Kingston X6TCK6-MIE, X6TCK6-HYA So you would have to buy all ram aftermarket as a kit.
Hello ! I bought an Alienware Aurora r11, I have a technical questions. 
Aurora R11, ram upgrade, 32GB to 64GB