Shuts down after an hour

My computer will play games for about an hour, then it gets really loud with fan going mental and it shuts down. There is nothing in event veiwer, it happens with older games on low settings. My PSU is 3 years old 750w Cit, please see pics of Speedfan, is it time for a new PSU?

OS win 8,its the same with win7.
AMD 5200+
ECS GeForce6100PM-M2 (V2.0)
2x2GB DDR2 800
3 drives, 3 USB

My PSU 750w - +3.3 30A, +5V 33A, +12V1 24A ,+12V2 24A, -12V 0.3A, +5Vsb 2.5A

3 answers Last reply
More about shuts hour
  1. temps too high, 12v rail too low check psu and fans
  2. Brought a new PSU, XFX 550w. Speedfan readings are still off, but no crashing. Starting a new build.

    Erm, solved?
  3. I would have said see if your CPU cooler needs a clean? Remove the fan and clean out the heat sync :)
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