I´ve bought my Alienware X51-R2 in August 2015. A few weeks ago I´ve made a clean install of Windows 10 Pro, 64 bit. I have only downloaded the networkdriver "Realtek Integrated Ethernet Controller RTL8111G Driver" (X51-R2_Network_Driver_41TT1_WN32_10.1.505.2015_A01.EXE).
My question is now:
Do I need all the drivers from the Dell Support side for my system, especially the "Chipset Drivers:
The drivers provided by Windows are generally generic or older drivers designed to get the component to work and do not include optimizations that Dell or other OEMs may have made. Example being the Nvidia driver for my 950gtx is 6+ months old if I got it from Microsoft's Windows Update.
Then again if it works it works. Its really up to you.