How to monitor power in windows. cpu volts?

Question

Iron

The RAM test is perfect. Changed the screw and ten.
The problem can be in the mother and in the power supply and in the cp?
But while I use RAM at 50%, then a dozen do not load Perez. Maybe a visionary?
In tanks and heroes 5 - freezes after ten minutes. Black screen and echo sound. Repeat the last second - a minute ... And after a minute of a black screen writes a dump on the screw and goes to reboot