I've not been successful trying this with HPE servers. Most server fans (Foxconn/Delta) run 2.8 amp or higher.
Not aware of any "silent" gaming grade fans that use more than 0.38 amps.
That's not even considering the CFM.
Amps * Volts is power. Power is a proxy (a moderately good one) for air movement (a mix of volume/mass at a specific [back-]pressure).
It’s not likely that a silent 2W fan will move a similar amount of air as the stock 14W fans. The enterprise gear from HPE is pretty well engineered; I’m skeptical that they over-designed the fans by a 7x factor.
Operating voltage tells you “this fan won’t burn up when you plug it in”. It doesn’t tell you “will keep the components cool”.
