DIY 4 pins CPU-Fan adapter to 4 pins CPU-Fan + 3 pins Case-Fan

Some Story background

After i saved the old Acer X1700 motherboard from trash by replacing capacitors, i noticed that the passively cooled GPU was overheating... 45-80+°C (idle/full)
It was time to add a case FAN ... - where ? ... There's no place in there!- Doesn't matter, there's place outside the case!
The real issue was the single FAN port on the motherboard, and no SATA/MOLEX port left.

Making the 4 pins to 4+2 pins
Why not 4 to 4+3?

Here is the scheme:

• The female 4 pins part is plugged on the motherboard CPU-Fan port.
• The Ground (black wire, pin 1), the +12V, the Sense (tachymeter) and the Control (PWM pulses) are wired to the CPU-Fan (4 wires PWM-capable), and
• the secondary (SYS) Fan only gets Ground and +12V.
• We have no use monitoring the rpm of that fan, and it may interfere with CPU-Fan control (on my testing AMD motherboard the CPU-Fan didn't work until i removed the sense connection on the secondary Fan.

CPU-FAN	SYS-Fan
GND +12V Sense Control	GND +12V not wired none

Making of
What are those colors???

On the first test i had wired the GND to an orange wire, for the final build the color scheme is slightly different:

MotherBoard	Main Cable part	CPU-FAN wires	Secondary wires	SYS-Fan
GND +12V Sense Control	Black Yellow Red Blue	Black Yellow Green Blue	Brown Blue None None	GND +12V Not wired (ctrl) None

Looks messy? and it is, but everything was done with what i had under the hand...

Results
IRL

The Fan used is fixed with plastic ribbons

GPU Temperatures are really lowered:

Before		After
Idle	Full	Idle	Full
45°C	80+°C	37°C	42+°C