I5 Temp.. should i be worried?

[who105]

Hey, I'm new to overclocking and i have a i5 running @ 3.5 ghz with idle temps of 43~45*c and max load under prime 95 to be around 62~64*C. However under intel burn test it peaks at 72~74*C. should i be worried? ambient temp is 28~30*C. Btw I'm using a coolermaster V8 heatsink

 

[JohnnyLucky]

What brand and model pc case do you have?