I do not understand the differences between pcie 3.0 x16 and pcie x16. I want to get a good video card for the PC that I am building but my problem is this. I am choosing a motherboard that only has pcie x16. The problem with this is the video cards that I can find for pcie x16 seem to be very cheap. Now if I change it up and go with a motherboard that has pcie 3.0 x16 then it changes the socket interface for the processor to FM2+ from AM3+ making it impossible to find a 6 or 8 core processor. Plz help me i don't know what to do. Basically i want a good processor AMD and a good video card.