Computer Overheat? Computer Power Down

[Loth]

For what you have in your case, I'd recommend at least a 750 watt PSU, preferably 1000.

? 1000 W PSU for a setup with a non-overclocked by the sound of it CPU with a TDP of 125W, 4 GB of memory in 2x2 modules and a graphics card running at about 19W!
A quality PSU of 300-400W would be the normal recommendation.

And never underestimate the effect dust buildup and poor cable management has on your components! Always keep your case free of dust, and be mindful of airflow when positioning cables. The more open space there is in your case the better.

Now this I can get aboard on, the better airflow you have in a case, the less strain you put on the CPU and GPU (and any other) heatsinks.

[Eekiki]

? 1000 W PSU for a setup with a non-overclocked by the sound of it CPU with a TDP of 125W, 4 GB of memory in 2x2 modules and a graphics card running at about 19W!
A quality PSU of 300-400W would be the normal recommendation.

Maybe I'm underestimating the power draw of that GPU under load. For me, I had troubles when I was using two GTX270s in SLI under load causing my UPS, which has a max load of 750W, to trip when running XIV.

Now this I can get aboard on, the better airflow you have in a case, the less strain you put on the CPU and GPU (and any other) heatsinks.

Yup yup. The effects of heat on your PC components are similar to the effects of an incline on your car. Even though you're driving the same way, with the engine doing the same RPMs, your performance is decreased because the engine still has to try harder to get the car up that hill.