5 minutes ago, Uzi1994 said:
you mean to say that you have connected all four fans using splitter on a single header of your motherboard?
You can do 4, or more depending on the total amps being pulled from the header. TYPICALLY (each mobo can be different) fan headers are rated at .8-1.2 amps. So 1.0 amps is safe to assume imho.
Most fans in PC cases (almost = but its easier to google to be sure) take up to .25 amps.