it's a common pb on P5B
you can try to (in order) :
set pcie @110MHz (or 96)
cool your nb and don't use high voltage on nb
set VSB at 1.7V
block your second peg @2X
well, in my case, after doing all that, it doesn't work

I'm not a lucky guy but solutions listed above worked for some people
edit: i just emailed asus support one more time about this problem even if i know that they don't care about it :/
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