I'm looking at swapping my existing 3570k for an i7. Originally I was only looking at a 3770k but I was wondering if something like that might be worth checking out assuming I can get one cheap enough. Now I have to run one of my cards in the bottom pci slot at pci-e 3.0 x4 (so the same as 2.0x8 I believe) and then top one at x16. Will there be a noticeable slowdown since the 2600k doesn't support pci-e 3?