Both temps seem high if that is in C... I would dust out the computer:
To dust out a pc I have recently been using a shop vacuum in "blower" mode with a small nozzle (blowing out rather than sucking in) mine has the option to move the hose to the exhaust port for blower mode. I like it better than an air compressor for the fact that no liquid will be in the air coming out. Air compressors can be used but I would recommend you have a water filter in the line and use no more than 40psi with a nozzle, also be careful not to overspeed fans, they can break quite easily. You will want to dust out the heat syncs and fans. Since you have a water cooler you will want to dust out the radiator as well, they hold dust well and take a bit more air to clean but that should fix any heat problems unless the water cooler has a problem or your connections are lose etc. Don't forget to dust out your power supply. PSU's may cause crashes and shutdowns as well.
FYI: CPU overheating shutdowns are generally an actual shut down with no restart/reboot after the machine instantly turns off. The mainboards typically shut off the pc entirely and you would have to push the power button to turn it back on. GPU's on the other hand generally just crash and reboot, often with a BSOD.
If there are no obvious hot temps while sitting idle you might want to try different benchmark tools to stress the components 1 at a time. Prime95 for the cpu stress test and furmark for the gpu stress test.
If prime95 crashes within 5-10 minutes every time, you may have a cpu cooling issue or cpu related issue, if that passes and furmark crashes every time then you have a gpu problem.
I generally do not let furmark run longer than 15 minutes. Most times I have had to deal with a failing video chipset furmark crashed within the first 10 minutes.
You can also monitor your temps while doing all of this using HWmonitor. If your temps are reaching near the max recommended, consider opening your computer case and dusting out your computer. I dust out my gaming rig about every 3 months. If you live in a dusty environment like myself and don't dust out your machine frequently, you will start to have overheating issues. Overheating chipsets even once can damage them.
Edited by zingo156, 27 January 2015 - 09:20 AM.