I uploaded pictures. It's at the start of page 2.
I'm not sure what my cooler is. I guess I just got the respective cooler that came with my CPU i5-4670k CPU.
Also, I forgot to mention my case is...

I'm not sure what that is.

Oh, no. I just moved it there to take my picture. And besides, I haven't used the heater in half a year. I keep the case under my table a meter away from the heater

I tried with thermal paste today and it didn't help.

Here: DSC 0071 — imgbb.com and DSC 0067 — imgbb.com and DSC 0069 — imgbb.com

I did the CPU Burner for about 10 minutes and my CPU went up to 82° C without crashing. Does that answer your question?

I did the GPU stress test for 12 minutes. The highest my Intel (R) HD 4600 was 80° C (Furmark Intel RHDgraphics — imgbb.com) and my 780 went probably up to 72° C (Furmark780 — imgbb.com)

Your GPU temperatures will rise quickly while Furmark is running. Keep a keen eye on them and abort the test if temperatures rise too high[/QUOTE]

If I may ask, how high temperature is too high?...

When I was playing a game all of the sudden it crashed, my monitor went to sleep and I hear a fan inside my computer starting to blow like crazy. Since nothing else seems to happen I turned off the...

Today I tried putting in another GPU and it worked so it's definitely the GPU that is the problem. Hopefully my guarantee will cover this.

This happened while I was playing a game: When a level was loading (not for the first time, normally it would load) the game froze and I couldn't quit the game so I restarted my computer by holding...