Hello there fellow overclockers. I thought of walking past the line of "safe" and decided to overclock. Currently I'm running on this specs:

Intel Core i5 2500k | Cooler Master V8 180w | GIGABYTE P67A-UD3-B3|4 GB X 2 Kingston RAM | Asus GTX460 | Kingston 1TB | GIGABYTE Odin Plus 700w | Raidmax Enzo


What are the parts that can be overclocked? Does it increase performance that much or just a little? Do I only need to use a software or must I use certain hardwares too other than coolers. Basically, I'm really new at this and hoping for all the fellow good people here to help me. I'll put it in point forms.

1. What are the parts that can be overclocked?
2. Does it increase performance on a large scale?
3. Do I need to tweak my hardwares too or just use a software?

Okay, thanks.