A:Answer This PC can handle 4 sticks of RAM upwards of 32GB for each stick for a total of 128GB of DDR4 RAM, and I believe it supports up to 4000mhz RAM speed but I am not exactly sure.
On a side note, look at my review on this PC. If I were you, stay clear of Alienware prebuilt PC's. If you don't know how or can't afford to build your own from scratch, at least go to Corsair since they actually know how to build pretty decent desktops.