Re: Change fan speed?
Only if you're computer is capable, and very few are... There are some simple mods you can do to speed up and slow fans down, though.
I beleive the yellow wire is the 5 volt, so if you connect this to the +, the fan will run about half speed(they normally just use the 12v/RED wire)
There are also controllers you can get, or fans that are auto adjusting...