I have made a mistake and bought the non "K" version of the i5 3570.
Thou, i could OC it to 4.1 Ghz, and it's stable. I did Prime95 tests for 8 hours and over. The temps and lower the 60 deg.
The OC was made automatically by AI Suit 2, the Asus Z77-V LX2 MOBO software. The BCLK was set to 103, and multiper is 40.
For now, i feel pretty good with what i have achieved, but my question is:
Is there any possible way to 'unlock' the non "K" version? By software or physically?
And one more thing: Do i need to OC it even more? I think that it doesn't bottleneck my Gigabyte GTX 670, am i right?