I just built my system and here's the spec of the system:
AMD phenonIIx4 965
Asus M4A79XTD EVO
OCZ DDR3 memory
I was running prime95 to make sure everything is stable and was running speedfan at the meanwhile. Everything was fine for a while. After a while, the CPU fan stopped spinning and I had to restart to make it to run. I tried running prime95 again with speedfan closed. It's doing fine for the past 10 hours or so. I'm wondering if I configured speedfan wrong or other stuff that I did. One specific problem I can think of is that I have QFan (Asus BIOS controlling the fans?) turned on. I don't know if it would make a difference.
I have another question concerning speedfan. Does it control 3-pin fan header also or 4-pin fan header only? My case fans only came with molex. I am thinking of buying the moles to 3-pin converter so I can use speedfan on the case fans too.