I just relaced the fan on a Zalman 7700 CPU cooler that is on a LGA775 CPU. The mobo is an Asus P5B-E.
The new fan that I used was a Arctic 12 PWM with a four pin connector and it had a second single wire that attaches somewhere. The original Zalman fan only had a 3 pin connector. I could not connect the new fan to my fanmate controller as it would only accept three pin connectors.
Upon rebooting I got a BIOS error - CPU fan failed. But I could see that the fan was working and upon booting up it was fine. Temps looked fine as well. But Speedfan also didn't see the fan as it wasn't reporting a speed. Therefore I couldn't really control the fan speed.
I found another Fanmate controller that I had around that had an open type of connector so it could accept the four pin connector. I added that and rebooted again. I still get the CPU fan error but at least I could control the fan speed and noise, albeit mechanically. I have shut off the CPU error notification. The system seems fan - idle core temps are 30C or so and after running Prime95 for 30 mins I get up to 60C (according to SpeedFan) and 64C acording to CoreTemp. Those are a bit high but I am not too worried since I don't really do hardcore stuff on this computer.
A few questions:
Why does my mobo not see the fan? Is it a bad idea to use this fan as a CPU fan? What is the other lead for on the CPU fan? Should I connect this somewhere? Is this supposed to be connected to the CPU fan connector on the mobo?
This photo below isn't exactly what I have on my new CPU fan, but it does show the connector with the single wire. What do I do with the single yellow wire connector on the left in this photo - where does it go?