@ Martin9744
Martin if you are asking these questions because you're considering a build from scratch to build yourself a high end gaming machine, you might want to wait a little while and do some further investigation, because as of August 29th DDR4 system memory will be available, it is already listed at Newegg.
Meaning we are soon to see some major hardware changes as the next step is motherboards that will support DDR4 memory and the next generation of Intel arriving on the scene, none of us know for sure exactly when this is going to happen, but they're not soon to release DDR4 system memory modules for nothing.
http://www.newegg.com/Product/Produ... 600521523&IsNodeId=1&name=288-Pin DDR4 SDRAM
Change is on the horizon and I would not even consider a new build right now until we see what's coming!
I also would like to say that a high end gaming machine unless the game is CPU intensive is always best performance in the GPU corner, no matter if the CPU is 2nd, 3rd, or 4th generation Intel or AMD FX for that matter.