> To stick a multimeter into the incision 220 volts?
As an option. However repeatedly met with the fact that instead of the current value of the alternating current, the multimeter shows anything.
You can determine the degree of BP load indirectly, on the level of heating. Many units have a fan speed controller depending on the load. If the fan plowing at maximum speed, so the power reserve is almost gone.
We should not forget that the power consumption of the computer is very uneven. A large peak is at the time of inclusion.
I would in your place not to skimp, and put BP obviously with the stock.