M17xr3/r4/Ranger - Plug and Play High RPM CPU fan mod

How well does this work? I want to get away from HWInfo

 

Hello,
I am trying to mod my HP 8770W’s cooling system and I did manage to get
an original 11,4CFM m17x r4 GPU fan.
I have to cut it to fit the heatsink of my laptop and I really need your advice on which among those two is the better option in my case- the one from M6700, rated at 13CFM or the one I bought which is 11,4CFM?
Also does it matter which side should be up and which - down?

Here are some pics of the original one for 8770 and the one for m17x r4:

Here is how the 8770W´s heat sink looks like:

 

Hey, that's what I'm wandering about too!?
All this time I'm looking for some DPST switch to have both wires on/off at the same time and boy I have looked and nothing quite fits.
I wouldn't want those really cheap ones, they have low numbers on how many time they can do the work so I think replacing one when it quits would be pita. All the good ones on the other hand are too big. It would look awful and you would have to butcher the chassis.
So if mr Striker did in fact splice both pwm wires to one switch and its ok I would consider doing the same. SPST switches are easier to find in the size required i think.
The GPU fan is controlled with CPU pwm signal on auto, press the switch and its noisy but kool=)!

 

Or wire up a PWM circuit that has a temp probe:
https://www.aliexpress.com/item/32905642042.html



I found one on USA ebay for $9 so ordered. Going to try it out. Seems just need to find a suitable 12V line for input to the controller then only use the PWM & temp sensor. Keep the GPU fan power coming from the laptop 5v.

 

which wire should we cut can you provide any picture

 

Usually the blue wire.

 

All wires are black

 

Might need to look up the schematics of the laptop and find which pin then.

 

I guess that also decrease the life of fan as it's working at 100% speed

 

take a good look at the pics in my post on the previous page
Blue is third one from the left