Adding a fan made system unstable?

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Joined
2 Oct 2003
Posts
106
Location
St Albans
MSI x99 7
i7 5960x
psu 750 corsair silver
h110

I set up my system last week and overclocked it to 4.4ghz fine and stable, but I couldnt add the rear case fan as the h110 took up one more fan header than I had, so I ordered a fan splitter to split up two 120mm case fans which arrived today. After adding the final 120mm fan, my system is no longer stable.

Is the power draw of adding one more fan, only running at 10% speed, really enough to tip a machine over? If the fans speed up to 100% (which would pull much more power than fewer fans at 10%), the stability doesnt change. It isnt a temp thing either, it does it from cold and temps never exceed 60c
 
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