Yes, you can overclock non-K sandy bridge and Ivy Bridge CPUs if your motherboard supports overclocking. There are three ways to do it. You can overclock up to 4 bin-multiplayers above its turbo boost (raised bin turbo overclocking), make sure all cores run at its max default turbo (not quite overclocking), or slightly increase the BCLK (BCLK overclocking). The BCLK overclock is the most unstable. For example for raised bin turbo overclock, you can overclock a 3.2Ghz/3.6 turbo i5-3470 to 4GHz max turbo.