[citation][nom]soldier37[/nom]Question is how much faster more efficient, cooler will these be than my 2600k overclocked to 4.5 currently? How many frames per sec will it help in BF3 over my 2600k? Worth an upgrade?[/citation]
I suppose you can OC an IB a little higher than SB because of IB's lower power consumption. However, I doubt it's financially wise to upgrade from SB to IB, you're better off waiting for a few more years as by that time, SB would be unable to handle the future games.
But if you want to set over $200 on fire for a rather small performance boost, then be my guest.