Just a thought but have you tried setting PCIE Frequency to 101-103mhz or 110-114mhz???
I've read that it can increase stability but don't ask me how, these ranges were determined by mikeyakame and gave him extra stability on the Rampage Formula
EDIT:The reason it adds sability is apparently when set to 100 and you OC the FSB it raises the PCIE frequency when it isn't supposed to. Setting it to 101 or higher sets the value permantly and thus allowing for a bit more stability. You may have to slightly increase the SB voltage a little though
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