Nice setup. I am trying to find out if i can overclock them to 425 or 450Mhz. With your setup i have a better cooling then now. Going to find more of these fans 
What values should be set for 425 or 450 MHz ?I mean:
freq_value'
'chip_freq' '425'
option 'timeout'
chip_freq | GH/s/chip | freq_value | timeout
https://bitcointalk.org/index.php?topic=348327.msg3850360#msg3850360