@Amoncz Yes because it can use all of its 8 threads, synthetic tests in all their glory.
Most (and I really mean most) games use less than 4 threads, which is what an 4670k has. As your GPU will most likely be your bottleneck anyway it doesn’t matter anyway, you won’t get more FPS with a 4770k compared to a 4670k if the GPU can’t handle more.
As me and @LordCrash has stated earlier SLI/Crossfire often brings trouble, and it also consumes more power than a single card. You may make a bargain now, but you will most likely lose all that price/performance with higher energy bills.
This is just what I think of course, it’s still up to you. I’m just trying to make you save some money that you could spend on something else
EDIT: Well if you are running 2560x1440 you could definitely use the extra GB VRAM 780 (ti) offers in the future when games crank up the texture quality even more.
EDIT 2: If you are looking for price vs performance a 290X would suit you even better imo.