switch fan power supply

[koh_]

Hi everyone, I'm thinking of changing the fan from my "Cooler Master GX 650W" source.
However, the connector is 2-pin. I can not find fans of 2 pins here (I'm living in Brazil), only 3 pins.
Would it be any problem for me to cut the cable from the original 2-pin fan and couple it with a 3-pin molex?

Taking advantage of the occasion, should I use a fan with high pressure or high CFM? Maybe this Akasa Viper is enough?

Sorry for my English..

Thank you all.

Specifications:
- Dimension 120 x 120 x 25mm
- Bearing HDB (Hydro Dynamic Bearing)
- Speed 600 ~ 1900rpm
- Airflow 83.63 CFM (141.75 m3 / h)
- Noise level 6.9 ~ 28.9 dB9A)
- Current 0.17A
- Pressure 2.64 mm-H2O
- Service life 50,000 / hrs
- Double Bearing Ball Bearing
- 4-pin PWM connector (with RPM sensor)
- Voltage 12V

 

[RememberThe5th]

The main question is can you plug the 3PIN into 2Pin without connecting the "Green wire" also know as PWM signal, which sends how much does the fan rotate.
If the 2pin is +(red)-(black) and on your 3PIN also in same way + and - you can actually just plug it in (it must match the notch how you are connecting it).
Just discharge the PSU when you are taking apart because of the electric shock that may give you. (as you plug it in and doesn't match the notch and pins for positive and negative i suggest you the last option).

If it doesn't match up, then you can cut your old fan and wire it up to the new fan while cutting the green wire all the way soo it doesn't interfere with inner components.
This requires your Soldering iron, some solder wire to solder, and probably shrink tube or electrical tape.

 

[koh_]

thank you!
Just to be sure, Akasa viper would be a good Fan (CFM x Pressure) for the power supply?

 

[RememberThe5th]

The power supply is small box, the CFM is actually good for its purpose, the fan will ramp up according to sensor built in inside of power supply.
As for quality of the fan (by that i mean audible sound) it wont be loud, if it is you can swap it anytime.

 

[koh_]

It was a big help, thanks for everything!