i understand pcie 2.0 is not being fully used up yet but i want to build a gaming rig (amd for sure) that will last for some time, i have the sabertooth gen 3 unopened but its a very confusing board as the reveiws for it are so drastically different. will it support 3.0 without a cpu that has a 3.0 controller? is it better off i just sell it on and buy a different mobo?