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Welcome to the forums :)
It's your PC.
What CPU cooler have you got?
Is your case adequately ventilated?
What are your GPU and CPU temps while under load?
It's not your PSU that's hot is it? That would be a disaster in the making!
Could be your motherboard that is the bottleneck. When I had an Asus Crosshair II board and a 955 Black Edition, I bought some new GPU's a while after I built the computer. It actually ran worse. I later figured out the PCIe standard had moved on and I simply did not have enough throughput to make it work properly.
That system is past its prime by a ways. That is not to say it won't run it. Largely it depends what you expect from it and what resolutions you are wanting to play it on. I had an AMD FX 8350 8 core and a Crosshair V board and it got to where it could not play the game at 4k and maintain above 30fps, even with SLI. Once again changing the video cards did not help.
If your PC shuts itself OFF, there is something wrong with it, not the game. The game is just pushing it. When they shut clear off suddenly, that is usually indicative of overheating as you surmised. It also can be if your power supply is going out, or not big enough. If this started after you added the card. I'd first check to make sure your power supply is big enough for that GPU. Next, I'd verify something didn't get accidentally unplugged when you were putting the card in. If the PC is air cooled, make sure the fans are spinning, particularly the CPU. You might try leaving the side panel off to see if that makes a difference. Also check to make sure the heat sink is not plugged with lint and dust. If it is liquid cooled, I'd automatically assume the pump has went out unless you have a way to verify otherwise. This would be especially cool if it is an All in One (AIO) unit and is as old as the processor. My 8350 I mentioned above had an old Antec unit on it. It worked for about 4 years then it would randomly shut off. It kept doing this, eventually doing that even just when idling. I finally had to take the PC into a quiet room, do the power supply jumper trick (jumper wire between the green wire on the ATX connection to any black wire on that same plug) and put my ear to the pump. I could hear it stop and start randomly.
You can verify that the game itself is not the cause. Just download and run the benchmark / stress test program of your choice and run it. You can also use a program such as HWMonitor to keep an eye on your temps. It will show the current, as well as hottest temps. That said, I don't think it will save a log file that would still be accessible after it shuts off without saving. But, with a benchmark program running, you can watch it on the screen. Opinions vary, but for me for 24/7/365 use, I never let mine get above 65 degrees Celsius.
Where do you live? Is it hot there? Is the room the PC is in still cooled or are the windows open?
Closing thread.