Stormhunt1 :
Cpu: Intel core i5-3450 3.10 GHz 3.50 GHz
Ram: 10GB
OS: 64-bit Windows 8
GPU: nvidia gtx 760 2gb
PSU: 550w Great wall
How do you know it is heating up or overheating?
And it just dawned on me: Have you thoroughly cleaned out the computer, including blowing out the PSU really well with canned air or an air compressor (no more then 50PSI).
Also, you didn't post the specs (amps and watts off the sticker on the side of the PSU) nor what mobo, what case, how many fans. This could all be caused by a lack of good airflow.
For troubleshooting: Make certain that the PSU fan is working. I do NOT believe that that is a "semi-fanless" power unit, that is, a PSU that its fan only spins when it reaches a certain temperature. It should be spinning as soon as you turn it on.
I read one of your other posts, and it is beginning to sound one of two things, at least to me:
1. Your PSU is starting to fail. And if it is truly overheating the failure will occur sooner rather then later. Time to replace with a quality unit from Corsair(TX, AX, HX), Rosewill (CAPSTONE), Seasonic, XFX, Antec, EVGA G2 or P2. And I would get a 600-700 watt unit if affordable.
2. Your system may be using more power then normal, therefore your PSU is having to run at nearly 100% all the time. This would be Normal in heavy gaming where your Video card will draw a lot of power. And if you play BF4 or Crysis (anyversion), or other graphically intense games, for long periods of time, then the psu can get toasty - especially if the fan isn't working properly. That heat can cause the PSU to produce less power; power degradation due to heat does occur in nearly all PSU's. Top of the line PSU's are rated at 50 degrees Celsius internal or ambient temeratures; less well made units at 25C or room temperature not the temperature inside a PC running BF4 all out at 50+FPS.
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