With Sandy Bridge and Ivy Bridge, standard Core i5 and i7 processors offer enough multiplier headroom for 400MHz overclocks. K-series chips are only required to push higher. Things are different for Haswell, which removes the multiplier allowance for standard CPUs, making multiplier-based overclocking exclusive to K-series processors."
Any major computer upgrade generally requires a full software reinstall too. No so if you heed the advice in the guide to Upgrading a Motherboard without Reinstalling. PCSTATS Tips