You cannot overclock the chipset.
If you mean overclocking the CPU, it is very simple with a "K" series cpu, i.e i5 2500K / i7 2600K.
Just go to the BIOS, CPU configuration, CPU multiplier, change it to whatever you want.. (max is 57, multiplier x 100 = speed (e.g CPU ratio 42 means 42x100 = 4200MHz / 4.2GHz)
Next, go increase the voltage (vCore / CPU voltage) if the computer is crashing.
After that, make sure you have RealTEMP or any temperature monitoring tool to monitor your temperatures. Also download CPU-Z and PRIME95.
If you have all 3 programs make sure you run them after doing the tweaks in the BIOS. Run Prime95 for at least 2 hours to make sure it can run well. If it crashes during that period of time, increase the voltage.
If you want it to be super stable, do a prime95 torture test for at least 12 hours. Make sure you check that the CPU is running at the correct speed in CPU-Z.
Check your temperatures. If you're going over 70, then you have a problem. Either you have a stock cooler, using a underpowered after market cooler or did not install the cooler properly.
Don't touch the B-clock if you want to overclock. It will barely make a difference and it is not very adjustable with Sandy Bridge CPU's
If you have a MSI motherboard or ASUS motherboard, just turn OC GENIE on or TURBO V on. It will automatically overclock up to 4.2GHz for MSI OC G, and higher with ASUS TURBO.