Power Supply Fan Replacement, questions

[std]

Due to the heat that is making in my country the power supply fan is noisy, there is not a technical failure, sound like air, but still annoying, I have no choice, change psu fan or psu supply.

Current fan specifications are:

Brand: ADDA
Model: AD1212UB-A70GL
Dimensions: 120x120x25 MM
Voltage: DC 12V
Current: 0.50A
Power: 6.0W
Speed​​: 2500 RPM
Air Flow: 98.6 CFM
Noise: 43.3 dBA
Bearing: Ball
Termination: 2-Wire Leads


Now my questions are these:

1) Should I buy a fan with PWM?, in order to the power supply continue doing the speed control?
2) If I buy a fan with 2-pin connector, I can just disconnect the old fan, and plug-in the new one, or should splice and solder anyway with the old connector?
3) And the most important, the current fan is 2500RPM, if I put another fan whose speed is 1500RPM for example, the power supply would force him to go beyond that?


PD: sorry for my bad english.

 

[Jorona]

What kind of PSU?

 

[drklu]

I've also heard the protective shroud causes a lot of noise for the air flowing through it. Some have removed this with good results but, then you have to be careful not to hit your fan.

 

[std]

What kind of PSU?

The PSU is a NZXT Hale82-M 750w, I read other topics about the issue of noise (loud), its not just me, is a great psu but is a bad fan.

I've also heard the protective shroud causes a lot of noise for the air flowing through it. Some have removed this with good results but, then you have to be careful not to hit your fan.

I have the psu at the bottom, so takes air from outside the case, I have no carpet or even filter or something which block the fan.

The problem is the fan, so I want to change it.