|"is that 30C temperature at rest (idle) or under load? measured from BIOS or 3rd party software?"|
At rest from BIOS.
"is the cpu fan connected to the motherboard via a 3pin connector, or just plugged into power? the 3 pin connection on the mobo allows the computer to control rpms based on temperature."
3 Pin to 3 pin cpu fan on motherboard.
"as long as your CPU temps are okay, there's no reason why you couldn't just buy a quieter fan. just make sure it will fit on your current heat sink."
The thing is, I used this fan on the old Motherboard/CPU, another Sempron, and it was never loud.
"There are settings in Cool & Quiet for when the fan kicks in. Check those and possibly raise the settings. "
My only choice that I see is enabled/disabled?
"Is the CPU cooling fan connected to the CPU fan header?"
My only guess is that the motherboard is crap and the Cool N Quiet is defective.