Some late night suggestion: Be practical. Please stop living in dream.
Getting stable 5GHz needs to fill up lot of factors, depends heavily on the chip, your OC'ing experience (which I presume is nil at this point of time just from your post), Corsair H100 as cpu cooler (Noctua NH-D14 can't push beyond 4.8GHz and remain stable) and above all a very good motherboard (at least Asus P8Z68-V pro, deluxe or extreme-z is better for higher power phases).
If you achieve 4.5GHz stable without burning motherboard or/and processor, then you should be very happy with your achievement.