These i7 4770K Temperatures And Voltage Values Are Normal With Z87-G43?

Hello everyone,
I recently upgraded my good old Core2Duo rig and bought a new cpu-motherboard-ram trio. My new specs is as follows:
- i7 4770K @ stock speed + Coolermaster 212Evo cpu cooler
- MSI z87 g43 motherboard
- 2x4 GB G-Skill Ripjaws X 1866Mhz
- Case: Corsair Carbide 400R
The problem is I wasn't aware of that new Haswell cpus are running slightly hotter and now I'm little bit worried about my temperatures. Since I was also planning to overclock my cpu a bit and trying to find a point that doesn't need a vast voltage increase, I'm losing my sleeps over this situation at the moment.
Anyways. I'm using softwares like HWmonitor, Coretemp, Realtemp and Intel Extreme Tuning Utility. Turbo Boost is also active. So the cpu is going up until 3.9 GHz. Other than that I'm on stock speeds, and motherboard's default values. Here are my temperatures:
Ambient room temp: Varies between 23-25 °C
Idle: 28-30 °C
While playing demanding games like Battlefield 4: Max 58-65°C
With Intel Extreme Tuning's stress test for 15 mins: max 65-70 °C
With Prime 95 Blend and OCCT burn tests for 15 mins: max 78-82 °C
I also run realtemp's sensor test and the values are identical since it's using Prime95 too.
I also noticed that Prime 95 and OCCT is increasing my cpu voltage value from 1.156 to 1.21 while Intel Extreme Tuning's stress test and BurnInTest is using 1.156v. All these test are using %100 of the cores. Couldn't understand why there's a voltage increase on certain tests which leads my temps go even higher and higher. Will I encounter these kinds of random voltage increases during normal tasks? Like playing games, rendering some stuff etc..?
On the other hand I tried motherboard's OC Genie future to see what happens. It overclocked the cpu automatically to 4.0 GHz @1.10v. With this setting I've seen max of 70 °C for a second and mostly 65-68°C under OCCT stress test. And also my voltage didn't increase at all and sit at 1.10. I'm a bit confused about these values. Since with default settings I'm getting hotter values and my voltage is going up to 1.21 with Turbo Boost under Prime95/OCCT burn tests. I also found out that my BIOS is v1.0. I don't really have a performance or a stability issue for now except this voltage thing. Does a BIOS update help on that situation? I don't really like to touch something already working OK and end up with a dead board.
Also I'm wondering if my temperature values are normal with the cpu cooler i have (Coolermaster 212evo)?
I also could buy some extra fans for my case (1 exhaust to top & 1 intake to side) and maybe a second fan for the cpu cooler if you guys think that these would help a bit.
Sorry for my English by the way. I'm not a native speaker.
Thanks for all your comments and suggestions already.

Thanks for the reply Nichrome,
I will follow your suggestions for the fans. Currently I don't have any fans on top. But I'm considering to buy some fans to top and side. So you get better results with top fans being exhaust right?
Also which fan are you using as the second fan for the cpu heatsink? I would buy one of these as well since we have the same heatsink.
I'm also using the default/auto voltages and settings at the moment. Just Turbo Boost is enabled and when it kicks in voltage is going up to 1.156. Which seems normal and doesnt produce dangerous level of heat. The thing is if I start running Prime95&OCCT the voltages going up to 1.21+ level at the same turbo boost speed (which is 3.9 GHz). And that produces a lot more heat than usual. But if I use BurnInTest or Intel Extreme Tuning Utility stress test the voltages sit at 1.156 and under full load on all cores. I'm wondering what's the reason of this difference and if it is software or motherboard related. Even with using the OC Genie @ 4.1 GHz temperatures and voltages seem lower than the stock&auto settings (idle 35-38 / stress test with OCCT 70C max, gaming 60-65C max). I'm not sure if a BIOS update would fix this. Since the whole BIOS flashing process is creeping me out. I don't like to bother with something that is already working OK. Don't want to end up with a dead board in the end :P Maybe I'm becoming a bit paranoid though, since this is a really hard earned upgrade after 6 years. :P

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