200x20 for 4GHz can be achieved with the right cooling and motherboard.
Youll need to put a lot of time and effort in learning though because we wont just hand out 'settings'. You have to learn what your system is capable of, especially where its getting on a bit now
All CPU's will require some effort putting in. Its simpler with the newer generation CPU's but for those of us that call ourselves enthusiasts thats taken a lot of the fun away
Please remember, that guides are just that. As TTL has said, you need to learn what your chip can do, make sure you have appropriate cooling (Not stock) and you are willing to put in the time to learn as you go.
Any further issues or if you need anything clarifying just ask.