I was looking to build a system with one of these two processors. I was leaning towards the 3820 because it is socket LGA 2011, which should have further compatibility in the future. The i7-3820 on x79 has quad channel memory support as well.
What is the performance difference between the two? Which is better for multitasking/gaming?
No matter what cpu you choose as long as its an i7 you'll be able to have any setup you want even the original i7's could handle a gtx titan sli with no apparent "bottleneck" but me personally go for the 2011 socket over the 1155