I would think the new fan doesn't need to move at such a high RPM to move as much air, and it should definitely be much quieter.

Think of a bathroom fan vs a small fan (these are kind of comparable, in my mind).

A bathroom fan is a blower and they are God awful loud, but don't move much air. The blades are just like this blower fan.

A desk fan is about the same size, but the blades are 1/3rd the noise and it moves a lot of air.


Cars don't use the blower style fan, run at much lower ram, are quiet, and are designed like your new card. Maybe evga figured out the fan from the ACX moves just as much air at half the volume and just as good at performance specs.
Install that both of them, set them at 50% fan, and see if the air coming out of the back is substantially different?

Also, the bios does look like you state, 1050 minimum and 4800 max. You can do the same thing with the original card to see if the bios are both set the same.