1) If you want to see if similar voltage spike exists in real life, then you need to watch it closely for a long time to see if it happens or not. Note that you might not see the spike with digital multimeter even if it exists, if it happens fast. With analog multimeter chances are better, but you really need to watch all the time, because you can easily miss it if you look away for a second. Better to use oscilloscope here, but that is in different price category. 2)If you connect a multimeter once and do a few tests - gaming, other stress tests, you will see how voltages changes with load. Then you will know how good or bad voltage readings are and if you need to worry about them or not. 3) if funky voltages exists, then you can take it back to the store. 4) It's not that simple. Monitoring depends on programs too. For example HWmonitor reads 10V on 12V rail, but Aida64 reads 12.096V. Generally if readings are wrong, then they are really wrong. If you find a program that reads monitoring chip's data right, then I don't see problem here. Of course it can be few mV off the real life, but it doesn't make it completely useless. <This is only my opinion, but on my PC I don't see monitoring chip to be completely wrong, only programs that reads data from it.