Hello, I have an Intel core-i5 2500k ..........i heard that it is good for overclocking.......bt i don't know how to overclock........my mobo is ASUS P8 Z77 VLK.........so i want to overclock my gpu from 3.3 GHz. to 3.5 GHz. as my PC doesn't have any cooler .............another question........will overclocking increase my gaming speed? and will the overclocked results be shown in my computer properties and will it increase my windows experience index rating? thanks.........in advance.........