This convertion cable compatible with all 3-pin fans and even 4-pin PWM fans. In case to connect 4-pin PWM fan, you just need to leave the blue color PWM signal cable aside and your fan will still work fine with full speed.
Not enough fan sockets on main board? Don't worry! Get this cable and you can connect your D type 4pin fan directly to your PSU.
Now with this convertion cable, you can bring as many fans into your PC case as you like.