Hi,

It sounds like you are somewhat new to overclocking so I would first of all suggest reading up on the following guide to help make you more familiar with the different option found within the BIOS.

http://rog.asus.com/forum/showthread.php?5836-ASUS-Rampage-IV-Extreme-Easy-Overclock-Guide

Going for 5Ghz straight away might not be the best of ideas if you are still learning, I would advise trying 4.6Ghz and then working your way up from there if possible.

What cooler are you using? Socket 2011 CPU's generate a LOT of heat when overclocked so you might have a cooling bottleneck.

First off, you have to make sure that you have good cooling! Second thing is that the Sandy Bridge /E dies cannot be overclocked by BLCK frequency but rather by multiplier which would not have much noticeability from 4.6 ghz -5.0 ghz in real life. The overclock speed was always more noticeable using BLCK frequency than multiplier. I got mine up to 4.54 ghz using 1.38v. It booted and ran most programs until I ran a game and then I got the BSOD. I now have it OC at 4.3 ghz rock stable. 5.0 ghz may be unrealistic for this processor depending on the cooling that you have

Hello my friend the guide that was posted above is a very good place to start.

Once you have worked through the guide and tried a few settings we can see how it goes.

Just so all the others know Javier has a pretty good custom water cooled system so I think his cooling will be ok. Not to say you should not keep an eye on your temps at all times my friend.

Cheers for now.