Hmm, I would see about downloading CPU-z and maxing it out. It would probably be a better reading. I've happily got my 3770k running at 4.6GHz so I wouldn't worry about it as long as you've got the cooling. You didn't change your base clock did you?
Sandy bridge and Ivy bridge non-k CPUs can turbo up to a CPU multiplier of 4 on supported boards. My i5 3470 runs at 3.8 to 4Ghz and my i7 2600 can go up to 4.2GHz.
According to Intel you can do it on P67 and H67 as well, @BGL Didn't know it worked on 3rd gen CPUs too, the only documentation I find about it is for 2nd gen.
The thing is that you would need to set it up in the BIOS, otherwise the 3770 won't go past its normal 3.9GHz boost speed. Judging by how surprised Xellot is about the fact that it runs faster than a stock one should, I don't think he looked at OC'ing options.
Yes, it was a surprise to me that it was there in Ivy Bridge. I think Intel quietly stopped talking about it. On my i5 4570 (haswell) the only tweak you can do is have all 4 cores run at the max-turbo speed on supported boards.
It does make the i5 3470 a great little chip if you are building a second system from used parts, you can often pick them up really cheap, my one now powers the family gaming system with a 980Ti - no signs of CPU bottlenecks :-)
Yeah, my own 2500 has no issues feeding a pair of 4GB MSI 770s either. (or at least it didn't have issues with that, nowadays it's running at stock speed again and using the integrated graphics because I turned it into a secondary PC)