Water-cooling (Corsair Hydro series)
Windows 7 64bit ultimate
I've had my system for 2 years now, and only recently did this problem start. I use Realtemp to show my CPU temperature at all times. On average, my idle temp is between 25-35C (depending on ambient temperature). On heavy loads it goes to maybe 60C
Every night, I put my computer to sleep (I almost never shut it down before going to bed). Recently, when I resume it the next day, I see the CPU temperature steadily climbing. Going past 50, 55, 60, 65, at which point I immediately shut down my system. (power off)
After turning on my PC again, everything is fine, and my temperature is where it should be.
What is weird is that, this temperature rise only happens on occasional wake-ups. Most of the time, it resumes from sleep and behaves normally just fine.