I flashed P2.10 on my Z68 Extreme4 Gen3 and I am using an i7 2600K and all seems ok to me.
I have noticed that you can use slightly lower vcore with P2.10 then L2.05, however I'm confident that it is only because LLC 1 is more aggressive then earlier and vcore seems to jump a fair bit over your set vcore when under extreme load (ie. Prime95, OCCT:LINPACK, etc).
Still, it seems to run a little cooler at idle and under general use, and doesn't look to run any hotter when under extreme load - so it's kind of a welcomed bug, if you could call it a bug.
There is still no support for DDR3-2400 with SB though, DDR3-2133 is the max you can set in the bios, and anything above that can only be achieved by raising your BLCK. But that is no different to all previous bios releases, so it isn't a negative.
I have not checked, but tbh I don't feel there is a need to downgrade from P2.10. It is as more stable then the early 1.XX bios releases, and is as good as L2.05, with the addition of what I mentioned above.
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