4.3-4.5 is a relatively low OC, with a NH-D14 you'll be fine; I was doing 4.4GHz with a 212 EVO at ~75c with stock TIM and 4.6GHz at ~65c after delidding and the D14 is a much better cooler. Now I'm on water doing 4.8GHz with max of 50c (although it was a bit cold, normally hottest core is 55~57c)
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