The nice folks at big008.com forwarded me the answer. So here it is.
The different between FCA, FMA and FC are, FCA is fan control turn on/off by
the motherboard depend on temperature of the case, and with speed adjustable
button. FMA is fan speed monitored by motherboard and with speed adjustable
button. And also FC is is fan control turn on/off by the motherboard depend
on temperature of the case. Also, they all fully support Pentium 4. If you
have any further questions, you are welcome to email me at
leona@big008.com.
Thank you.
-------------
Leona
Customer Service
http://Big008.com




