POWERSUPLLY is extreem belangrijk tbv stabiliteit. Pi trekt gemiddeld weliswaar een lage stroom, maar deze kan enorm pieken. Zie hieronder uit
klik:
Why am I so picky about power bursts? Because in a normal computer, big capacitors are added and power supplies are fast regulators to deal with big power bursts. Mind you, the Intel 4 Core CPUs are rated up to 130W at 1,1V, means 120Amps or so, while in idle mode, actual power consumption is 30W or less. Hence the power consumption jumps between 30 and 130 Watts in milliseconds, as CPU power/load is required. We should understand, that despite the small size of the Pi, the Quad-Core CPU in there is a high performance beast of burden!! Due to the size of the Pi, they had no chances putting big capacitors onto the board, and they unloaded the burst problem to an external power supply, which is then by many users replaced by a simple Mobile wall plug, underestimating the untold power requirements of the Pi.
One more word concerning Power. I have seen specs for the Pi, saying it should be supplied w/ 5.1V ! That's essential, because the Pi has at the entry a self healing poly-fuse and a diode to protect it against power connections in the wrong sense (+/-). The price to pay for is that the self healing fuse has a significant internal resistance; That means that right at the power entry to the Pi there is a loss of 100-200 mV, variable with the current intake. Just running it at a Mobile charger, which are not so stable and go under heavy load even below 5V, the Pi is starving for Power. For the full story and differences between Pi2/3, please refer to the original page, which shows IMHO a bit an optimistic view. Scroll down to the power section of the table and moreover to the respective power chapter in the text. Notice the 2.5A under RPI3 and be aware that the RPI 3 Documentation still lucks individual updates, because the RPI3 is so much similar to the RPI2, except for power !