what is the power consumption of the card? have you tried to OC it or alter config to boost hashing?
Not sure about power, but I use to run it on a 300 watt PSU,
I have overclocked it to the most AMD Overdrive allows. (900 MHZ Core, 1150 MHZ Memory)
I have never seen it go over 55c, and I have ran it full load for days at a time. (My case has very good cooling, though.)
Not messed with any alt configs. Used this, which seems to work: --shaders 480 --intensity 16 --worksize 128 -g 1 --scan-time 10
Could probably be tweaked, but I used it as a hobby card.