Ok heres my prob. I have an AMD Thunderbird 1400 o/c to 1520 by increasing the multiplier from 10.5 to 11 then increasing the fsb. I have good cooling so temp is not a prob. However even though my system is stable if increase my fsb more my usb cable modem stops working. Any ideas how i can resolve this prob or am I going to have to be satisified with my current speed?