I am going to buy a laptop for 3d rendering from sketchUp-Vray and I wonder that cpu or gpu is more important? for example what will be the difference between a 4th generation i7 and 6th generation i7? and does it really matter the rams? ddr4 or ddr3? I will buy a minmum 970m or 980m gpu. I live in Belgium and my budget is max. 2000€ I am planning to buy an Asus or MSI or Alienware. Thanks for the replies.