If the ivy bridge E coming out, it still can support LGA 2011 right? I would like to save on the i7 3820 for upgrade to ivy bridge E, my main concern is my current i7 920 seem like bottlenecking my GTX 590 Quad sli, just don't want to have bottleneck...
This is valid thinking, you can save money now by buying the cheapest 2011 CPU, which will net you the same performance as a 2600/2700K, the only differances is the 1155 will be easier to overclock because they are unlocked.
The problem with 1155 boards will be your 2 590s will be choked down to 8x each, the 2011 boards will give them 16x each
With Ivy Bridge coming out people buying all new gear can buy Z77 MB an IB CPUs and throw in a set of 7970s, or 680s,(which run very close and sometimes beats the 590) and run everthing at PCI-e 3.0, the 8x per graphics card wont be much of a problem, but I'm not sure how much your 590s will gain in this setup, because they are PCI-e 2.0, just gotta wait a few more weeks until 1155 IB is out and see how older cards respond to this setup by reading reviews.
Sandy Bridge-E can provide full 16x PCI-e 2.0 to your 590s right now, by the time they release IB-E(and if we don't need new motherboards) the 2.0 PCI-e of your 590s will become the bottleneck.
3820 and the 3930K will both overclock about the same(with the 3930K being alittle easier because it's unlocked) but you will have 50% more performance because it has 6 cores(12 threads)
Depending on the games you play the 3930K may be a waste of money(if the game can't use that many cores/threads) but for everyday computing it will be a monster(50% faster than the 3820, in programes that can use the extra cores and threads, total waste in those that can't)
You have to look at what your trying to get out of the system? If all you want to do is run Crysis 2 on a 1080p 120Hz monitor, the 3820 will be just fine. If you want to Metro on 3- 2560x1600 monitors your better off being happy with what you have, while waiting on next gen stuff.
point is, we need to know what you want from your next computer? give us alittle more info.....