Just to let you know, I have one 5830 mining on win7 and another one on BAMT; they are both overclocked with same values, but the second one goes up to 312Mh/s, instead of 290 Mh/s of the card running on windows. Too bad I can't use linux for work (yeah, I'm mining 24/7 @office too).
BAMT with multiple 5830s:
core_speed_2: 1020
mem_speed_2: 300
core_voltage_2: 1.125
fan_speed: 80
kernel: phatk2
Running at 330Mhash/s +, very stable @ 60C.
LOVE BAMT!