Fan header and fan control

i have the gaming 3 and i realized that the fan control wont let me go below 50% on case fans so i was wondering  if i can Y cable my cooler master jetflo 120mms as at 50% they run at 1400 rpm which isnt even 50%. but if plugged in a cpu header i can reduce it to 600 rpm. (can system fans get this support)
but ive heard these fans are very power hungry so i was wondering what the max a cpu fan header can support

It shouldn't be a problem to use 2 fans on a single header. I use such a splitter and never had issues. Once I had 2 Delta fans (can't remember models etc) but according to the spec, even single of these on a fan header was already out of fan header's specification (Amps)  But nothing broke, though I suggest to not use such powerful ones
Now the % stuff:
CPUFan headers can go down to 25% (or even 12.5%) IF the fans connected to such headers are 4 pinned (PWM). If they're 3 pin and connected to CPUFan header, they will run 100% without possibility to control it.
SystemFan headers are between 50% and 100% no matter if you use 3 or 4 pin fans. Though 3 pinned can be controlled compared to CPUFan header.

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