Most of the time the temperature is around 45-60°C, but whenever I do something that takes more processing power such as rendering a video, the temperature will get up to around 85-100°C, I think one time I saw it go a little over 100°C. I read somewhere that the highest temperature it should get to is 88°C. So is it unsafe that mine is getting hotter than that, or will it be fine? I've only had it for about 2 weeks, and I'm using it with a corsair h115i.
Yes, it is unsafe. You need to re-evaluate your cooling system and provide proper ventilation, and make sure you have applied the thermal paste correctly.
It’s pretty well ventilated, there’s 6 fans installed for ventilation. I don’t know why the cpu cooler wouldn’t be cooling it enough, everything appears to be installed correctly and I applied the thermal paste exactly how it should be. Do you think there could be a problem with the processor itself?
Many of these cooling solutions rely on the motherboard's fan speed control capability to determine the pump/fan speed. You may also need to look at the configuration of this fan speed control subsystem to ensure it is properly advancing the duty cycle of the pump/fan at appropriate temperatures. This is typically done in the BIOS configuration.
Hope this helps,