Underpowered GPU or software problem ???!!!

I have an old problem, when I am playing heavy games the GPU shuts down and the screen goes black while the sound continues playing normally for 4 or 5 seconds then the sound dies until I press the restart button.
The computer (sometimes) after I press the restart button sounds a long boot-peep and restarts again until I unplug the power cable.
The question is: is it an underpowered GPU or a software problem ???!!!

My PC specifications:
Core I-5 2400
8GB Team Elite 1333MHz ram (2*4GB)
Powercolor HD 6770 1GB GDDR5
Western digital 750GB
Power supply 350W
2 answers Last reply Best Answer
More about underpowered gpu software problem
  1. your power suply is not enough that is the porblem
  2. Best answer
    Definitely look into the PSU boss.. I think you need a minimum for that card of 550w
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