Why is my computer freezing up?

Question

Iron

As far as I understand, this question will be a continuation of this:
Why does Battlefield 3 freeze tightly?
But unfortunately I didn't find the answer here. The computer also freezes when playing bf3 multiplayer.
I play on the i5-4670 with its own built-in video, no other problems were noticed anywhere, before there were no problems when playing for about an hour, now after 10 minutes, the reset button does not even help, only turning off the power by holding the button on.
Interested in where to look for a problem, or forget about this bf3, or something is wrong with the PC.
Thanks in advance for the answers
UPD1:
I ran the OCCT test, the computer went out almost immediately
I changed the settings in the motherboard, turned off the turbo boost, OSST worked for 10 minutes, after which I manually turned it off, the temperature of the processor was 63 max, the cores were 70-73 each
. For myself, I decided that I needed to at least change the thermal paste, and the motherboard is a little cheap and just didn’t pull the turbo boost, if you have any other ideas, please
unsubscribe Motherboard - Asus z87 plus mAtx
Bp - Zalman for 500
Processor - i5-4670
Video - intel HD 4600

Answer 1

+1 to run hard test and run memtest.

Answer 2

Such symptoms sometimes occur when the video card overheats.