Is that on air? I've always been too chicken to go past 3.2 on my 920. It has one of those gigantic coolers that can run without a fan, but I keep a low speed one on it. Even at 3.2 it was a monster. Still is. I refuse to play/pay the upgrade game when I have something that works so well.
I do recode video so I know Haswell would be faster and cooler.
The only other thing is that I enjoy building, which I haven't done in quite a while now. This older hardware (2x 5850, 4x 74GB Raptors in RAID0) is keeping up fine. Games are great at 1440. PhotoShop is fast too.
I tend to keep things until they full-on break or are completely incompatible. I drive a 21yo car and still watch TV with a CRT. I'm not the typical 'need to have the latest' guy, and my savings account sure does appreciate it!