Does A Missing Nut Matter?

I received the Cooler Master V8 with one wrong nut. It's too lose to be secured with the backplate and the cooler itself. I'm using this fan with only 3 nuts on the back-plate. Is this the reason why my CPU, originally running 70 C when playing BF3 (intense load) now runs 95 C? Or is it the way I smeared... show more I received the Cooler Master V8 with one wrong nut. It's too lose to be secured with the backplate and the cooler itself. I'm using this fan with only 3 nuts on the back-plate.

Is this the reason why my CPU, originally running 70 C when playing BF3 (intense load) now runs 95 C? Or is it the way I smeared the thermal paste? Or how I installed it upside down?

(Yikes I made a lot of mistakes...)
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